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Article

Survey of Volvariella (Agaricales, Basidiomycota) including Two New Species, V. neovolvacea and V. thailandensis, from Northern Thailand

by
Jaturong Kumla
1,2,*,
Nakarin Suwannarach
1,2,
Nopparat Wannathes
3 and
Saisamorn Lumyong
1,2,4
1
Research Center of Microbial Diversity and Sustainable Utilization, Chiang Mai University, Chiang Mai 50200, Thailand
2
Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
3
Microbiology Program, Faculty of Science and Technology, Pibulsongkram Rajabhat University, Phitsanulok 65000, Thailand
4
Academy of Science, The Royal Society of Thailand, Bangkok 10300, Thailand
*
Author to whom correspondence should be addressed.
Diversity 2022, 14(3), 161; https://doi.org/10.3390/d14030161
Submission received: 28 January 2022 / Revised: 17 February 2022 / Accepted: 21 February 2022 / Published: 24 February 2022
(This article belongs to the Special Issue The Hidden Fungal Diversity in Asia)
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Versions Notes

Abstract

:
During the period from 2018 to 2020, a survey of macrofungi in northern Thailand was conducted and seven specimens of Volvariella were collected. The morphological characteristics and phylogenetic analyses of the internal transcribed spacers (ITS) and large subunit (nrLSU) of the nuclear ribosomal DNA (rDNA) sequence data indicated that three specimens belonged to V. bombycina and V. volvacea. Four other specimens were distinct from all other known species within the genus Volvariella. We described these specimens as two new species, namely V. neovolvacea and V. thailandensis. Comprehensive descriptions, illustrations, line drawings, and a phylogenetic tree are provided to show the position of the two new species. The comparisons between morphologically similar and phylogenetically related species are also discussed.

1. Introduction

The genus Volvariella was first proposed in 1898 with V. argentina as the species type. Volvariella species are known to be widely distributed throughout Africa, Asia, Australasia, Europe, and America [1,2,3,4,5,6,7,8]. They are recognized as saprobes and are mostly found on the ground in grasslands or forests. They have also been found to grow on dead wood and on the litter of the forest floor [7,8,9,10]. Volvariella has been characterized by pluteoid basidiomata, the presence of volva, a pink to pinkish brown spore print, ovoid to elongated basidiospores with a smooth surface, and by appearing inamyloid [10,11,12]. Currently, V. volvacea is commercially cultivated as an edible mushroom in Asia, especially in China, India, the Philippines, and Thailand [13,14]. Volvariella has been placed within the families Amanitaceae [15], Agaricaceae [16], and Pluteaceae [11] of the order Agaricales. In 2006, this genus was placed in the family Pluteaceae based on phylogenetic analyses [17]. However, a later molecular study conducted by Justo et al. [18] separated the Volvariella species into two genera, namely Volvariella and Volvopluteus. Volvopluteus was placed in the family Pluteaceae; however, Volvariella formed a more distant position from the family Pluteaceae and was more closely related to genera Cantharocybe and Cuphophyllus in the family Hygrophoraceae. Therefore, Volvariella should be treated as incertae sedis of the order Agaricales [18]. According to the Dictionary of Fungi by Kirk et al. [6] and He et al. [19], about 50 species of Volvariella have been reported worldwide. However, there are 143 records of Volvariella names in the Index Fungorum (Index Fungorum 2021, accessed on February 2022), including specific and infraspecific taxa, illegitimate names, invalid names, and names widely accepted as taxonomic synonyms. These names can include species that have not yet been well-documented and may also include misidentifications.
Only eight species of Volvariella, namely V. bombycina, V. cubensis, V. hypopithys, V. pseudovolvacea, V. pulla, V. pusilla, V. rostricystidiata, and V. volvacea, have been previously recorded from Thailand [6,20,21]. Many studies have proposed that Thailand has proven to be a hot spot for novel species discovery [22]. Recently, this has been further evidenced by the discovery of many new species of macrofungi [23,24,25]. In this study, we found seven Volvariella specimens during our investigations of macrofungi in northern Thailand during the period from 2018 to 2020. Amongst these, two new species, V. neovolvacea and V. thailandensis, were introduced based on studies of their morphological and molecular data. We used a combined analysis of ITS and nrLSU of the rDNA sequence data to confirm the taxonomic status and infer the phylogenetic position of these two species.

2. Materials and Methods

2.1. Sample Collection

Volvariella was surveyed at Chiang Mai, Mae Hong Son, and Sukhothai provinces, Thailand during the rainy seasons of the years 2018 to 2020. The collection in Sukhothai province was granted permission from the Department of National Parks, Wildlife and Plant Conservation, Bangkok, Thailand (document No. 0907.4/13696). Basidiomata were collected and wrapped in aluminum foil and kept in plastic boxes. Specimens were dried in a hot air oven at 45 °C until they were completely dried. They were then kept in a plastic zip-locked bag and deposited in the Herbarium of Bangkok Forest Herbarium (BKF), Bangkok, Thailand and Sustainable Development of Biological Resources (SDBR-CMU), Faculty of Science, Chiang Mai University, Thailand. MycoBank numbers are provided [26].

2.2. Morphological Observation

Macromorphological data were derived from fresh specimens. Color names and codes followed Kornerup and Wanscher [27]. Micromorphological data were derived from dried specimens that were rehydrated in 95% ethanol, followed by distilled water, 5% KOH, Congo red solution, or Melzer’s reagent. Micromorphological characteristics were examined under a light microscope (Nikon Eclipse Ni U, Tokyo, Japan). Size data of the anatomical structure (e.g., basidiospores, basidia, and cystidia) are based on at least 50 measurements of each structure using the Tarosoft (R) Image Frame Work program. For basidiospore statistics, measurements are presented as (a)b–c–d(e), where ‘a’ and ‘e’ are the extreme values, ‘b–d’ is the range containing 90% of all values, and ‘c’ is the average. Q represents the ratio of length divided by the width of each basidiospore and Q represents the average Q of all specimens ± standard deviation.

2.3. DNA Extraction, Amplification and Sequencing

Genomic DNA of dry specimens (5 mg) was extracted using a Genomic DNA Extraction Mini-Kit (FAVORGEN, Ping-Tung, Taiwan). The ITS region was amplified by polymerase chain reaction (PCR) using ITS4 and ITS5 primers [28] under the following thermal conditions: 95 °C for 2 min, 30 cycles of 95 °C for 30 s, 50 °C for 30 s, 72 °C for 1 min, and 72 °C for 10 min on a peqSTAR thermal cycler (PEQLAB Ltd., Fareham, UK). The nrLSU region was amplified with LROR and LRO5 primers [29] under the following thermal conditions: 94 °C for 2 min, 30 cycles of 95 °C for 30 s, 52 °C for 30 s, 72 °C for 1 min, and 72 °C for 10 min. PCR products were checked on 1% agarose gels stained with ethidium bromide under UV light. PCR products were purified using a PCR Clean-Up Gel Extraction NucleoSpin® Gel and PCR Clean-Up Kit (Macherey–Nagel, Düren, Germany) following the manufacturer’s protocol. The purified PCR products were directly sequenced. Sequencing reactions were performed and the sequences were automatically determined in the genetic analyzer at 1st Base Company (Kembangan, Malaysia) using the PCR primers mentioned above.

2.4. Sequence Alignment

Analysis of the sequences was conducted by similarity searches using the BLAST program available at NCBI (http://blast.ncbi.nlm.nih.gov, accessed on 21 December 2021). The sequences from this study, previous studies, and the GenBank database (with ≥60% query coverage and ≥85–100% sequence similarity) were selected and listed in Table 1. Multiple sequence alignment was performed with MUSCLE [30]. The alignments were manually checked. The combined ITS and nrLSU alignment was deposited in TreeBASE under the study ID number 29067.

2.5. Phylogenetic Analyses

Phylogenetic analysis was carried out based on the combined dataset of ITS and nrLSU. Cantharocybe virosa and Cuphophyllus yacurensis were used as the outgroup. A phylogenetic tree was constructed under maximum likelihood (ML) and Bayesian inference (BI) methods. ML analysis was carried out using RAxML-HPC2 version 8.2.10 [40] on the CIPRES web portal [41] under the GTRCAT model with 25 categories and 1000 bootstrap replications [42]. BI analysis was performed with MrBayes v3.2.6 [43]. The best substitution models for ML and BI analyses were estimated by Akaike information criterion (AIC) in jModelTest 2.1.10 [44]. The best substitution models were GTR+I+G for ITS and nrLSU. For the BI analysis, six simultaneous Markov chains were run for one million generations with random initial trees, and every 1000 generations were sampled. The burn-in was set to discard the first 2000 of the trees, and the remaining trees were used to construct the 50% majority-rule consensus phylogram with calculated Bayesian posterior probabilities (PP). Branches with bootstrap support (BS) and PP values greater than or equal to 70% and 0.95, respectively, were considered to be significantly supported [45,46]. The tree topologies were visualized in FigTree v1.4.0 [47].

3. Results

3.1. Sample Collection and Morphological Observation

A total of seven specimens of Volvariella were obtained in this study. Morphologically, the specimen voucher SDBR-CMU505 collected from Chiang Mai province and the voucher BKF10217 collected from Sukhothai province were found to be similar to the morphological descriptions of V. volvacea. Notably, SDBR-CMUNK0726 collected from Mae Hong Son province was initially identified as belonging to V. bombycina. However, the morphological characteristics of the other four specimen vouchers (SDBR-CMUNK0758, SDBR-CMUNK0760, SDBR-CMUNK0957, and SDBR-CMUNK0958) collected from Chiang Mai province differed from the previously known descriptions of Volvariella species. These four specimen vouchers were representative of a potential new species. Therefore, the identification was then further confirmed by the multi-gene phylogenetic analyses of ITS and nrLSU sequences.

3.2. Phylogenetic Results

The sequences of seven specimens were deposited in the GenBank database (Table 1). The alignment of a combination of ITS and nrLSU genes contained 1989 characters, including gaps (ITS: 1–1039 and nrLSU: 1040–1989). RAxML analysis of the combined dataset yielded the best scoring tree with a final ML optimization likelihood value of −13,839.8771. The matrix contained 1030 distinct alignment patterns with 49.73% undetermined characters or gaps. The estimated base frequencies were recorded as follows: A = 0.2255, C = 0.2599, G = 0.2697, T = 0.2448; substitution rates AC = 1.1148, AG = 2.3791, AT = 0.9787, CG = 0.8637, CT = 5.0398, GT = 1.0000. The gamma distribution shape parameter alpha was equal to 0.3033, and the tree length was equal to 4.9110. In addition, the final average standard deviation of the split frequencies at the end of the total MCMC generations was calculated as 0.00826 through BI analysis. Phylograms of the ML and BI analyses were similar in terms of topology (data not shown). Therefore, the phylogram obtained from the ML analysis was selected and presented in this study. The phylogram was comprised of 50 specimens of Volvariella and two specimens of the outgroup (Cantharocybe virosa SDBR-CMUNK0280 and Cuphophyllus yacurensis QCAM5891) (Figure 1). A phylogram clearly separated our four specimens into two monophyletic clades with high support values (BS = 100% and PP = 1.0). Accordingly, they were clearly distinguished from the previously known species of Volvariella. Two specimen vouchers, namely SDBR-CMUNK0758 and SDBR-CMUNK0760 (introduced as V. thailandensis), formed a sister clade to V. sathei with high support (BS = 100% and PP = 1.0). Moreover, the two specimens in this study, SDBR-CMUNK957 and SDBR-CMUNK95 (described here as V. neovolvacea), formed a sister clade to V. thailandensis and V. sathei with 91% BS and 1.0 PP support values. Additionally, the other obtained specimen vouchers, SDBR-CMUNK505 and SDBR-NW1022, were placed within the same clade of V. volvacea, while the specimen voucher SDBR-CMUNK0726 was placed within the clade of V. bombycina.

3.3. Taxonomic Description of New Species

Volvariella neovolvacea J. Kumla, N. Suwannarach and S. Lumyong, sp. nov. Figure 2.
MycoBank: 842646.
Diagnosis: Similar to V. volvacea but differing in a wider basidiospores.
Etymology: Name derived from the macromorphological similarity to V. volvacea.
Holotype: THAILAND, Chiang Mai province, Chiang Mai University campus, 18°48′6″ N 98°57′23″ E, elevation 331 m, on soil in grassland, July 2020, J. Kumla and N. Suwannarach, SDBR-CMUNK0758.
Gene sequences (from holotype): OM417503 (ITS) and OM373653 (nrLSU).
Pileus 65–80 mm in diameter, convex, umbo and slightly inflexed margin, brownish orange (5C3) to greyish brown (6E3–7E3), non-hygrophanous, with fibrillose to appressed squamulose surface; margin decurved to straight, thin, crenulate; context soft, white (4A1) to light yellow (4A5). Lamellae free, ventricose, close, moderately thin, soft, orange white (6A2) turning pinkish white (7A2) with age; edge finely fimbriate, concolorous with faces; lamellulae present, very variable in length, mostly in one tier. Stipe 85–110 × 20–25 mm, central, tapered from the base to apex, solid, grey (6B1), entirely pubescent; context white (4A1) to light yellow (4A5); annulus absent. Volva 30–50 mm high, thick, mostly free, saccate, fragile, white (6A1) to greyish brown (6E3). Spore print pinkish (7A2).
Basidiospores (6.5)6.7–7–7.5(8) × (5)5.2–5.5–6(7) μm (n = 50), Q = 1.14–1.45, Q = 1.28 ± 0.1, broadly ellipsoid to ellipsoid, thick-walled, hyaline, inamyloid. Basidia 27–40 × 7.5–11 μm, narrowly to broadly clavate, hyaline, 4-spored; sterigmata up to 2.5 μm long. Pleurocystidia 45–98 × 23–77 μm, clavate to broadly lageniform, thin-walled, hyaline. Cheilocystidia 29–57 × 9–22 μm, clavate to broadly lageniform, thin-walled, hyaline. Hymenophoral trama inverse, made up of thin-walled hyaline hyphae, 5–20 μm wide. Pileipellis a cutis, with terminal elements 37–98 × 8–16 μm, variable in size, narrowly clavate to clavate, sometimes with a narrowed or slightly strangulated apex, colorless or with pale brown intracellular pigment. Stipitipellis a cutis, terminal elements 22–60 × 8–15 μm, cylindrical, sometimes with a narrowed or slightly strangulated apex, colorless or with pale brown intracellular pigment. Clamp connections absent in all tissue types.
Ecology and distribution: Fruiting solitary or gregarious on soil in grassland. Known only from northern Thailand.
Additional specimens examined: THAILAND, Chiang Mai province, Chiang Mai University campus, 18°48′7″ N 98°57′23″ E, elevation 331 m, on soil in grassland, July 2020, N. Suwannarach and J. Kumla, SDBR-CMUNK0760, gene sequences OM417505 (ITS) and OM417507 (nrLSU).
Diversity 14 00161 g002 550
Figure 2. Volvariella neovolvacea SDBR-CMUNK0758 (holotype). Basidiomata (a); Basidiospore (b); Basidia (c); Pleurocystidia (d); Cheilocystidia (e); Pileipellis terminal elements (f). Scale bars: (a) = 10 mm; (b) = 5 µm; (c–f) = 10 µm.
Figure 2. Volvariella neovolvacea SDBR-CMUNK0758 (holotype). Basidiomata (a); Basidiospore (b); Basidia (c); Pleurocystidia (d); Cheilocystidia (e); Pileipellis terminal elements (f). Scale bars: (a) = 10 mm; (b) = 5 µm; (c–f) = 10 µm.
Diversity 14 00161 g002
Note: Morphologically, the size of the pileus (65–80 mm in diameter) in V. neovolvacea was clearly larger than those of the brownish orange to greyish brown Volvariella species, namely V. aethiops (30–50 mm in diameter) [48], V. caesiotincta (44 mm in diameter) [49], V. morozovae (30–40 mm in diameter) [32], V. murinella (30–60 mm in diameter) [50,51], V. pseudovolvacea (30–60 mm in diameter) [9], V. thailandensis (35–60 mm in diameter), and V. taylorii (20–50 mm in diameter) [51] (Table 2). In addition, V. bakeri, distributed only in the USA, has a larger pileus size (100 mm in diameter) than V. neovolvacea [2,52]. However, the basidiomata size of V. neovolvacea was similar to V. pulla, V. rostricystidiata, V. terastia, and V. volvacea [4,6,9,51]. The smaller size of the basidiospores in V. rostricystidiata and V. terastia clearly distinguishes them from V. neovolvacea [6,9]. Additionally, the basidiospores of V. neovolvacea (6.5–8.0 × 5.0–7.0 μm, Q = 1.28) were wider than V. volvacea (6.0–9.0 × 4.7–5.7 μm, Q = 1.42) [9,15]. The wider size of pleurocystidia in V. neovolvacea clearly differed from V. pseudovolvacea, V. pulla, V. rostricystidiata, and V. terastia [4,6].
Our phylogenetic results from the combined ITS and nrLSU sequences confirmed that V. neovolvacea formed a monophyletic clade, which clearly separated it from the other morphologically related Volvariella species (Figure 1). The phylogenetic analysis also supports the determination that V. neovolvacea and V. volvacea are different species. Volvariella neovolvacea forms a sister taxon to V. sathei. However, the white to yellowish white pileus of V. sathei clearly separates it from V. neovolvacea [38]. The ITS sequence of V. neovolvacea is 95.64% and 94.00% similar to V. sathei (JN792550) and V. cf. sathei (KF926663), respectively.
Volvariella thailandensis N. Suwannarach, J. Kumla, and S. Lumyong, sp. nov. Figure 3.
MycoBank: 842647.
Diagnosis: Similar to V. taylorii but differing in a wider pleurocystidia and narrower cheilocystidia.
Etymology: Name referred to Thailand, where the new species was found.
Holotype: THAILAND, Chiang Mai province, Chiang Mai University campus, 18°48′22″ N 98°56′51″ E, elevation 348 m, on soil in grassland, August 2020, J. Kumla and N. Suwannarach, SDBR-CMUNK0957.
Gene sequences (from holotype): OM417510 (ITS) and OM417509 (nrLSU).
Pileus 35–50 mm in diameter, convex to plano-convex with a low broad umbo, greyish brown (6E3–7E3) with slightly darker color at the center, non-hygrophanous, with fibrillose to appressed squamulose surface; margin decurved to straight, thin, crenulate; context soft, light yellow (4A5). Lamellae free, ventricose, close, moderately thin, soft, pale orange (6A3) turning brownish orange (6C6) with age; edge finely fimbriate, concolorous with faces; lamellulae present, very variable in length, mostly in one tier. Stipe 40–65 × 4–5 mm, central, tapered from the base to apex, solid, greyish brown (6E3) to dark brown (6F5), slightly paler near the base, entirely pubescent; context light yellow (4A5); annulus absent. Volva 15–18 mm high, thick, mostly free, saccate, fragile, white (6A1) to greyish brown (6D4). Spore print pinkish (7A2).
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Figure 3. Volvariella thailandensis SDBR-CMUNK0957 (holotype). Basidiomata (a); Basidiospore (b); Basidia (c); Pleurocystidia (d); Cheilocystidia (e); Pileipellis terminal elements (f). Scale bars: (a) = 10 mm; (b) = 5 µm; (c–f) = 10 µm.
Figure 3. Volvariella thailandensis SDBR-CMUNK0957 (holotype). Basidiomata (a); Basidiospore (b); Basidia (c); Pleurocystidia (d); Cheilocystidia (e); Pileipellis terminal elements (f). Scale bars: (a) = 10 mm; (b) = 5 µm; (c–f) = 10 µm.
Diversity 14 00161 g003
Basidiospores (5.5)6–7–6.5(7) × (4)4.4–5–5.5(6) μm (n = 50), Q = 1.16–1.50, Q = 1.30 ± 0.1, subglobose to broadly ellipsoid, thick-walled, hyaline, inamyloid. Basidia 15–35 × 6–8 μm, narrowly to broadly clavate, hyaline, four-spored; sterigmata up to 3 μm long. Pleurocystidia 35–77 × 17–30 μm, broadly fusiform to lageniform, thin-walled, hyaline. Cheilocystidia 32–48 × 6–10 μm, narrowly to broadly clavate, broadly lageniform, thin-walled, hyaline. Hymenophoral trama inverse, made up of thin-walled hyaline hyphae, 3–10 μm wide. Pileipellis a cutis, with terminal elements 65–150 × 4–16 μm, variable in size, narrowly clavate to clavate, sometimes with a narrowed or slightly strangulated apex, colorless or with pale brown intracellular pigment. Stipitipellis a cutis, terminal elements 35–80 × 6–9 μm, cylindrical, sometimes with a narrowed or slightly strangulated apex, colorless or with pale brown intracellular pigment. Clamp connections absent in all tissue types.
Additional specimens examined: THAILAND, Chiang Mai province, Chiang Mai University campus, 18°48′21″ N 98°56′52″ E, elevation 348 m, on soil in grassland, August 2020, J. Kumla and N. Suwannarach, SDBR-CMUNK0958, gene sequences OM417510 (ITS) and OM386669 (nrLSU).
Note: Based on the morphology, the brownish orange to greyish brown pileus and size of V. thailandensis were similar to that of V. aethiops, V. caesiotincta, V. morozovae, V. murinella, V. pseudovolvacea, V. rava, and V. taylorii [9,18,32,36,48,50,51,52] (Table 2). However, the larger size of the basidiospores and basidia in V. thailandensis differs from V. pseudovolvacea [9]. The longer and shorter sizes of basidiospores in V. thailandensis clearly distinguishes it from V. murinella [50,51] and V. aethiops [48], respectively. Additionally, the pleurocystidia (35–77 × 17–30 μm) of V. thailandensis were found to be wider than of the V. taylorii (35–49 × 8–10 μm) found in Europe, South Korea, the USA, and Vietnam [18,51,52]. The wider cheilocystidia in V. caesiotincta (34–65 × 9.6–19 μm) [18,49], V. morozovae (40–50 × 13–18 μm) [32], V. pulla (24–87 × 9–17 μm) [4,6], V. rava (55–80 × 15–25 μm) [36], and V. taylorii (28–43 × 9–13 μm) [18,51,52] clearly distinguishes them from V. thailandensis (32–48 × 6–10 μm).
The phylogenetic analyses of the combined ITS and nrLSU sequences confirmed that V. thailandensis formed a monophyletic clade, which clearly separated it from the other Volvariella species (Figure 1). Volvariella thailandensis is closely related to V. neovolvacea and V. sathei. However, it is morphologically quite different from V. sathei which has white to yellowish white pileus [38]. Moreover, V. thailandensis is characterized by smaller basidiomata and wider cheilocystidia than V. neovolvacea (Table 2).

4. Discussion

Volvariella is widely distributed in both temperate and tropical areas throughout the world [2,5,6,7,8,53]. Traditionally, morphological characteristics have been used in the identification of Volvariella species [5,7,9,11]. However, identification can be difficult as some species have similar features. Thus, effective identification can be limited by certain morphological characteristics as well as the different environmental conditions that affect those morphological characteristics. Over the last two decades, molecular phylogeny has been an essential tool in the identification of Volvariella species [3,4,6,10,17,18,19,21,32,33,34,35,36,37,38,39]. Thus, the current classification of the genus Volvariella has been based on the combined data of the morphological characteristics and molecular data.
In 2011, six Volvariella species (V. bombycina, V. cubensis, V. hypopithys, V. pseudovolvacea, V. pusilla, and V. volvacea) have been recorded by mycologists in Thailand according to their morphological characteristics. However, in this regard, there is a lack of available molecular data [20]. Molecular data of V. volvacea from Thai specimen has been reported by Vu et al. [21]. In 2021, a new species (V. rostricystidiata) and a new record (V. pulla) of Volvariella were reported from Thailand by Niego et al. [6]. In this study, two new species of Volvariella (V. thailandensis and V. neovolvacea) and two previously known species (V. bombycina and V. volvacea), collected from northern Thailand, were identified based on their morphological characteristics and phylogenetic analyses. Thus, the number of Volvariella species recorded in Thailand has risen to a total of ten species, of which six species were confirmed by morphological and molecular evidence. Nevertheless, four Volvariella species listed by Chandrasrikul et al. [20] require further confirmation by molecular data. To our knowledge, our discovery is considerably important in terms of stimulating a deeper investigation of macrofungi in Thailand, and will help researchers better understand the distribution and ecology of Volvariella.

Author Contributions

Conceptualization, J.K., N.S. and N.W.; methodology J.K. and N.S.; software, J.K.; validation, J.K., N.S., N.W. and S.L.; formal analysis, J.K. and N.W.; investigation, J.K., N.S. and N.W.; resources, J.K., N.S. and N.W.; data curation, J.K., N.S. and N.W.; writing—original draft preparation, J.K. and N.S.; writing—review and editing, J.K. and N.S.; project administration, J.K., N.S. and N.W.; supervision, J.K., N.S., N.W. and S.L. All authors have read and agreed to the published version of the manuscript.

Funding

This research was supported by Chiang Mai University, Thailand.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

The DNA sequence data obtained from this study have been deposited in GenBank under accession numbers; ITS (MN492647, OM417503, OM417505, OM417506, OM417508, OM417510 and OM417513) and nrLSU (OM373563, OM373623, OM373644, OM373653, OM386669, OM417507 and OM417509).

Acknowledgments

The authors are grateful to the staff of Si Satchanalai National Park for their excellent field assistance and to Russell Kirk Hollis for kind help in the English correction. The authors are also grateful to Surapong Khuna and Netethip Khamkiti for phylogram preparation.

Conflicts of Interest

The authors declare no conflict of interest.

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Diversity 14 00161 g001 550
Figure 1. Phylogram derived from maximum likelihood analysis of 50 specimens of the combined ITS and nrLSU genes. Cantharocybe virosa and Cuphophyllus yacurensis were used as the outgroup. The numbers above branches represent bootstrap percentages (left) and Bayesian posterior probabilities (right). Bootstrap values ≥75% and Bayesian posterior probabilities ≥0.90 are shown. The scale bar represents the expected number of nucleotide substitutions per site. Sequences obtained from this study are in red. Type species are in bold.
Figure 1. Phylogram derived from maximum likelihood analysis of 50 specimens of the combined ITS and nrLSU genes. Cantharocybe virosa and Cuphophyllus yacurensis were used as the outgroup. The numbers above branches represent bootstrap percentages (left) and Bayesian posterior probabilities (right). Bootstrap values ≥75% and Bayesian posterior probabilities ≥0.90 are shown. The scale bar represents the expected number of nucleotide substitutions per site. Sequences obtained from this study are in red. Type species are in bold.
Diversity 14 00161 g001
Table
Table 1. Details of sequences used in the molecular phylogenetic analysis.
Table 1. Details of sequences used in the molecular phylogenetic analysis.
TaxaStrain/VoucherCountryGenBank Accession NumberReference
ITSnrLSU
Cantharocybe virosaSDBR-CMUNK0280ThailandMG694692MG694690[31]
Cuphophyllus yacurensisTQCAM5891EcuadorNR166388KY780119[32]
Volvariella aethiopsK(M):195631United KingdomMZ159529–Unpublished
Volvariella bombycinaAJ244SpainHM562212HM562256[18]
Volvariella bombycinaSDBR-CMUNK0726ThailandOM417508OM373644This study
Volvariella bombycinaxj2018071604ChinaMT351048–Unpublished
Volvariella caesinotinctaMA54717SpainHM562211HM562255[18]
Volvariella diplasiaCBS 355.64IndiaMH858454MH870086[21]
Volvariella dunensisJAC10587New ZealandMN738630MN738630Unpublished
Volvariella dunensisSCM3513SpainJF415140–[33]
Volvariella guttulosaTLE 313326Vietnam–NG068890[4]
Volvariella hypopithysTO AV137ItalyHM246492HM246488Unpublished
Volvariella kriziiTPR1516257Czech Republic–MK770133[34]
Volvariella kriziiBRNM 290000Czech Republic–MK770133[34]
Volvariella lepiotosporaAJ155USAHM562214HM562259Unpublished
Volvariella lepiotosporaFLAS-F-61505USAMH281874–Unpublished
Volvariella morozovaeTLE 313229VietnamMF377507MF377508[32]
Volvariella morozovaeLE 313323VietnamMK882995–[32]
Volvariella murinellaGLM:GLM-F42624GermanyMK412400MK412400Unpublished
Volvariella murinellaGLM:GLM-F43392GermanyMK412361–Unpublished
Volvariella neovolvaceaTSDBR-CMUNK0758ThailandOM417503OM373653This study
Volvariella neovolvaceaSDBR-CMUNK0760ThailandOM417505OM417507This study
Volvariella niveaTGDGM25489ChinaFJ749127–[35]
Volvariella niveosulcataTLE 313329VietnamMK882996MK883002[4]
Volvariella nullicystidiataSP393639BrazilEU920671EU920670[3]
Volvariella perciliataSP393635BrazilEU920672EU920668[3]
Volvariella ptilotrichaTLE 313324VietnamNR164612MK882997[4]
Volvariella pullaTLE 313325VietnamNR164613MK883003[4]
Volvariella pullaMFLU 19-1534ThailandMT074696–[6]
Volvariella pusillaTO AV139ItalyHM246494HM246479Unpublished
Volvariella ravaTGDGM41955ChinaKP784686–[36]
Volvariella reidiiF1-1.1FinlandMK770139MK770131[34]
Volvariella reidiiF1-1.2FinlandMK770140 MK770132[34]
Volvariella rostricystidiataTMFLU 19-1528ThailandMT074694–[6]
Volvariella rostricystidiataMFLU 19-1531ThailandMT074695–[6]
Volvariella cf. satheiHama193NigerKF926663–[37]
Volvariella satheiAMH 9436IndiaJN792550–[38]
Volvariella strangulataTO AV141ItalyHM246493HM246484Unpublished
Volvariella surrectaGLM:GLM-F61563GermanyMK412358MK412358Unpublished
Volvariella surrectaAJ55SpainHM562213HM562254[18]
Volvariella tayloriiAJ54PortugalHM562210HM562260[18]
Volvariella terreaLUG11010FranceJF415141–[33]
Volvariella thailandensisTSDBR-CMUNK0957ThailandOM417510OM417509This study
Volvariella thailandensisSDBR-CMUNK0958ThailandOM417510OM386669This study
Volvariella turcicaTOKA-TR17.1TurkeyMK770135MK770128[34]
Volvariella turcicaOKA-TR17.2TurkeyMK770136MK770129[34]
Volvariella volvaceaH6NigeriaKC894929–[39]
Volvariella volvaceaOE-273IndiaKC14211–Unpublished
Volvariella volvaceaBKF10217ThailandMN492647OM373563This study
Volvariella volvaceaSDBR-CMUNK505ThailandOM417506OM373623This study
Superscript “T” represents type species. “–” represents the absence of sequence data in GenBank database.
Table
Table 2. Comparison of V. neovolvacea and V. thailandensis with the closely related species.
Table 2. Comparison of V. neovolvacea and V. thailandensis with the closely related species.
Volvariella SpeciesDistributionPileus (mm in Diameter)Basidiospore (μm)Basidia
(μm)		Pleurocystidia (μm)Cheilocystidia (μm)Reference
V. aethiopsFrance30–507.0–11 × 3.7–7.2NR60–100 × 10–2560–100 × 10–25[48]
V. bakeriUSA1006.9–9.3 × 4.6–6.921–35 × 7–1147–71 × 11–3127–71 × 11–31[2,52]
V. caesiotinctaEurope and North Africa446.2–7.7 × 4.2–5.421–28 × 6.5–935–46 × 10–2534–65 × 9.6–19[18,49]
V. morozovaeVietnam30–405.0–6.2 × 3.3–4.313.5–20 × 7–8.545–50 × 18–3040–50 × 13–18[32]
V. murinellaEurope and Vietnam30–604.8–5.6 × 4.9–6.619–25 × 6–720–30 × 10–1545–65 × 8–15[50,51]
V. neovolvaceaThailand65–806.5–8.0 × 5.0–7.027–40 × 7.5–1145–98 × 23–7729–57 × 9–22This study
V. pseudovolvaceaSri Lanka30–604.2–5.2 × 2.5–3.514–16 × 4.5–6.532–45 × 12–1630–38 × 12–14[9]
V. pullaThailand and Vietnam40–755.5–8.0 × 4.0–5.016–19.5 × 7–925–56 × 6–3224–87 × 9–17[4,6]
V. ravaChina25–604.0–6.5 × 4.0–5.024–30 × 7–1035–71 × 11–3055–80 × 15–25[36]
V. rostricystidiataThailand55–855.0–7.0 × 3.5–5.517.5–29 × 7–1041–117 × 10–2551–80 × 14–39[6]
V. tayloriiEurope, South Korea, USA and Vietnam 20–505.0–7.0 × 3.0–4.820–24 × 6–835–49 × 8–1028–43 × 9–13[18,51,52]
V. terastiaSri Lanka60–1105.0–6.5 × 4.2–5.217–23 × 5.5–735–50 × 15–2232–36 × 10–13[9]
V. thailandensisThailand35–505.5–7.0 × 4.0–6.015–35 × 6–835–77 × 17–3032–48 × 6–10This study
V. volvaceaAsia and East Africa50–1006.0–9.0 × 4.7–5.730–35 × 7.5–9.045–120 × 17–3040–70 × 10–15[9,51], This study
“NR” = not reported.
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Kumla, J.; Suwannarach, N.; Wannathes, N.; Lumyong, S. Survey of Volvariella (Agaricales, Basidiomycota) including Two New Species, V. neovolvacea and V. thailandensis, from Northern Thailand. Diversity 2022, 14, 161. https://doi.org/10.3390/d14030161

AMA Style

Kumla J, Suwannarach N, Wannathes N, Lumyong S. Survey of Volvariella (Agaricales, Basidiomycota) including Two New Species, V. neovolvacea and V. thailandensis, from Northern Thailand. Diversity. 2022; 14(3):161. https://doi.org/10.3390/d14030161

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Kumla, Jaturong, Nakarin Suwannarach, Nopparat Wannathes, and Saisamorn Lumyong. 2022. "Survey of Volvariella (Agaricales, Basidiomycota) including Two New Species, V. neovolvacea and V. thailandensis, from Northern Thailand" Diversity 14, no. 3: 161. https://doi.org/10.3390/d14030161

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