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<I>Entoloma Sequestratum</I>, a New Species From

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<I>Entoloma Sequestratum</I>, a New Species From VOLUME 6 DECEMBER 2020 Fungal Systematics and Evolution PAGES 253–263 doi.org/10.3114/fuse.2020.06.12 Entoloma sequestratum, a new species from northern Thailand, and a worldwide key to sequestrate taxa of Entoloma (Entolomataceae) T.F. Elliott1*, D.J. Nelsen2, S.C. Karunarathna3,4, S.L. Stephenson2 1Ecosystem Management, School of Environmental and Rural Science, University of New England, Armidale, NSW 2351, Australia 2Department of Biological Sciences, University of Arkansas, Fayetteville, AR 72701, USA 3Key Laboratory of Economic Plants and Biotechnology, Kunming Institute of Botany, Chinese Academy of Sciences, 132 Lanhei Road, Kunming 650201, China 4World Agroforestry Centre, East and Central Asia, 132 Lanhei Road, Kunming 650201, China *Corresponding author: [email protected] Key words: Abstract: Based on our study of the morphology and genetics of sporocarps collected in the mountains ectomycorrhizal mushroom of northern Thailand, we herein describe Entoloma sequestratum as a new sequestrate member of the hypogeous fungi Entolomotaceae. This serves as the first report of a sequestrate member of the genus from Thailand. In new taxon addition, we provide a worldwide key to all of the described sequestrate members of the genus. Southeast Asia taxonomy tropics Citation: Elliott TF, Nelsen DJ, Karunarathna SC, Stephenson SL (2020). Entoloma sequestratum, a new species from northern Thailand, and a worldwide key to sequestrate taxa of Entoloma (Entolomataceae) Fungal Systematics and Evolution 6: 253–263. doi: 10.3114/fuse.2020.06.12 Editor-in-Chief EffectivelyProf. dr P.W. Crous, published Westerdijk Fungal online: Biodiversity 3 June Institute, 2020 P.O. Box 85167, 3508 AD Utrecht, The Netherlands. E-mail: [email protected] Corresponding editor: P.W. Crous INTRODUCTION genus Mycoamaranthus (Boletaceae), which was erected much later (Lumyong et al. 2003). Sequestrate fungi are widespread in a diversity of habitats around It has gradually become apparent through the application the world. They are commonly reported from temperate or semi- of newly available molecular techniques and morphological arid regions, but there are a growing number of species and genera re-assessments that many of the closely allied sequestrate and being discovered in the wet tropics (Castellano et al. 2011, Trappe non-sequestrate genera are poly- or paraphyletic; numerous et al. 2013, Verbeken et al. 2014, Smith et al. 2015, Castellano et nomenclatural changes have been made to resolve these issues al. 2016a, b, Sulzbacher et al. 2020). Sequestrate fungi belonging (e.g., Peintner et al. 2001, Geml 2004, Lebel & Tonkin 2007, to at least eight families have now been reported from the mostly Lebel & Syme 2012, Lebel 2013, Braaten et al. 2014, Kuhar et al. wet and tropical habitats of Thailand. These include the genus 2017, Lebel 2017, Elliott & Trappe 2018). Leucogaster in the Albatrellaceae (Dissing 1963); members of the Taxa in the cosmopolitan family Entolomataceae fulfill genus Descolea (syn. Descomyces) in the Bolbitiaceae (Ellingsen a wide range of functions in the environment, including 1982); the genera Mycoamaranthus, Octaviania, Rhodactina, and ectomycorrhizal associations with plants, decomposition of Spongiforma in the Boletaceae (Pegler & Young 1989, Lumyong organic material, and parasitic associations with other fungi or et al. 2003, Yang et al. 2006, Desjardin et al. 2009, Choeyklin et plants (Noordeloos 2004). Among the more than 1 500 species al. 2012, Vadthanarat et al. 2018); the genus Elaphomyces in the in the family, there is a great diversity of macromorphologies Elaphomycetaceae (in Castellano et al. 2016a, Elliott, unpubl. that range from gymnocarpic/agaricoid to entirely sequestrate/ data); the truffle-likeRadiigera tropica in the Geastraceae (Orihara gastroid forms (Cribb 1956, Co-David et al. 2009, Baroni & et al. 2008); the genus Hymenogaster in the Hymenogastraceae Matheny 2011, Gates 2012). The large diversity of species and (Dissing 1963, Elliott, unpubl. data); and the genus Tuber and in variety of morphologies led early mycologists to erect a number the Tuberaceae (Suwannarach et al. 2015, Suwannarach et al. of generic names that have not withstood the test of time or the 2016, Elliott, unpubl. data). Various sequestrate representatives “genetic era” in mycology. In the Entolomataceae, sequestrate of the Russulaceae have also been collected, but not all of their species were once placed in the genera Rhodogaster and generic relationships have been resolved (Heim 1959, Ellingsen Richoniella; however, many mycologists provided morphological 1982, Verbeken et al. 2014). Dissing (1963) also listed the presence and genetic evidence to show that these two genera do not of Melanogaster (Paxillaceae) in Thailand; however, from the form monophyletic lineages and should be combined with illustrations of spores and the description (we were unable to Entoloma (Dodge & Zeller 1934, Horak 1964, Dring & Pegler examine the collection), it appears that he was describing the 1978, Beaton et al. 1985, Horak & Moreno 1998, Co-David et al. Fungal Systematics and Evolution is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License © 2020 Westerdijk Fungal Biodiversity Institute 253 Elliott et al. 2009, Kinoshita et al. 2012). Our genetic and morphological data http://blast.ncbi.nlm.nih.gov/) based on BLAST searches and further confirm this, and we have made the decision to place the recent publications (Kinoshita et al. 2012, Morgado et al. 2013) new species described herein in the genus Entoloma. (Table 2). Single gene sequence datasets were aligned using the MAFFT v. 7.215 website (Katoh et al. 2016) and manually edited in BioEdit v. 7.0 and Geneious v. 10.2.3 when necessary MATERIALS AND METHODS (Hall 2004). Single sequence alignment datasets were combined using BioEdit v. 7.2.5 (Hall 2004). The alignment of combined Sporocarp collection and morphological observation datasets in FASTA format was converted to PHYLIP and NEXUS Editor-in-Chief Prof. dr P.W. Crous, Westerdijk Fungal Biodiversity Institute, P.O. Box 85167, 3508 AD Utrecht, The Netherlands. E-mail: [email protected] methods formats using the Alignment Transformation Environment (ALTER) website (Glez-Peña et al. 2010). Species of sequestrate Entoloma typically develop within the A Maximum likelihood (ML) phylogenetic analysis was leaf litter or partially below ground, so sporocarps are collected performed on the combined 4-gene alignment using RAxML- by raking away the leaf and upper soil layers in suitable habitats HPC2 v. 8.2.4 (Stamatakis 2014) on XSEDE via the CIPRES or by looking for areas where the soil surface is partially exposed. science gateway (Miller et al. 2010; www.phylo.org) with 1 000 Occasionally, specimens are partially emerged from the soil in bootstrap replications. The resulting ML tree was visualized with eroded or disturbed environments such as road banks or trail the program FigTree v. 1.4 (http://tree.bio.ed.ac.uk/software/ edges. Descriptions of macromorphological characters are figtree/). Maximum likelihood values equal to or greater than 50 based on fresh material. Colors are described in general terms are reported in the final tree. The phylograms were reorganized based on the observations of the authors. Tissues and spores using Microsoft Office PowerPoint 2007 and Adobe Illustrator from dried specimens were rehydrated and examined in water CS3 (Adobe Systems Inc., USA). The sequences generated in this mounts for study of microscopic characters. Spore dimensions study were submitted to GenBank (Table 2). were taken from 20 randomly selected basidiospores measured from the holotype collection (there was no observable variation Taxonomy in spore sizes between collections). For scanning electron microscopy of the basidiospores, fragments of the gleba were Entoloma sequestratum T.F. Elliott, S.L. Stephenson, Karun. & D. mounted on aluminum stubs with double-sided adhesive tape, Nelsen, sp. nov. MycoBank MB825011. Fig. 1. coated with gold palladium alloy, and then observed under an SEM (Hitachi S4800). Etymology: The name “sequestratum” refers to the enclosed (sequestrate) sporocarp. DNA extraction, PCR amplification, and sequencing Fresh Sporocarps up to 15 mm × 10 mm, globose to irregularly Approximately 0.02 g of fungal tissue was removed from globose to somewhat oblong. Stipeabsent. Peridium/Pileus with the interior of a sporocarp and placed into a sterile 1.5 mL occasional irregular pits, overall smooth, sometimes with small microcentrifuge tube. The sample was homogenized with invaginated pit or stub at the base, overall white to off-white a sterile pestle. DNA extraction was carried out using the and thin in section (< 1 mm), white and appearing solid in color NucleoSpin Plant II kit (Macherey-Nagel, Bethlehem, PA) throughout. Gleba/Hymenophore loculate to labyrinthiform, following the manufacturer’s protocol. To amplify the internal when young off-white to faintly pinkish but darkening with transcribed spacer (ITS), partial large subunit nrRNA gene maturation, lamellae fused to form compact and stuffed locules (LSU), partial DNA-directed RNA polymerase II second largest with whitish hyphae when young (Fig. 1B), but with maturation subunit gene (RPB2), and partial mitochondrial small subunit locules becoming empty and labyrinthiform and reaching (mtSSU), PCR conditions and primers were set under standard nearly 0.5 mm broad, hymenophoral trama darker in color conditions
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