Resupinatus yunnanensis Y. Yang & C. L. Zhao 2023, sp. nov.
Creators: name: Yang, Yang
name: Li, Rong
name: Liu, Chaomao
name: Zhao, Changlin
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Fungi
Basidiomycota
Agaricomycetes
Agaricales
Tricholomataceae
Resupinatus
Resupinatus yunnanensis

description: Resupinatus yunnanensis Y. Yang & C.L. Zhao, sp. nov. Figs. 1, 3, 6, 7
MycoBank no.: MB 847020
Holotype: — CHINA. Yunnan Province, Pu’er, Jingdong County, Taizhong Township, Xujiaba, Ailaoshan Ecological Station, E 100°53′41′′, N 24°23′36′′, elev. 1800 m, on the fallen branch of angiosperm, 24 August 2018, CLZhao 8651 (SWFC!), GenBank No. (ITS OP901839; nLSU OP904197).
Etymology: — yunnanensis (Lat.): refers to the locality (Yunnan Province) of the type specimen.
Basidiomata: —Annual, resupinate to cupulate, soft gelatinous when fresh, fragile when drying, up to 12 cm long, 3 cm wide, 0.5 mm thick, cups globose or depressed-globose, up to 150–500 μm in diameter, aggregated in groups, 3–6 per mm, buff (4A4) to slightly brown (5B/C7), covered in a dense mat of white hairs; hymenophore cyphelloid, buff (4A4) to slightly brown (5B/C7) when fresh, greyish (19C2) to pale mouse-grey (7C2) upon drying; sterile margin indistinct and slightly brown; subiculum felty, loosely attached to the substrate and densely packed, up to 200 μm thick.
Hyphal structure: — Hyphal system monomitic; generative hyphae with clamp connections, colorless, thin-walled, branched, interwoven, 1.5–3.5 μm in diam; IKI–, CB–, tissues unchanged in KOH. presence of crystal encrusted branched hyphae with short finger-like projections at the tips.
Hymenium: — Cystidia and cystidioles absent; basidia clavate, 12–36.5 × 4–8 µm, with 4-sterigmata and with a basal clamp connection, basidioles dominant, in shape similar to basidia, but slightly smaller.
Basidiospores: —Ellipsoid, colorless, thin-walled, smooth, with oil drops, IKI–, CB–, 4.5–9(–9.5) × 3.5–7 µm, L = 6.68 µm, W = 4.72 µm, Q = 1.32–1.71 (n = 90/3), Qm = 1.42.
Additional specimens examined:— CHINA. Yunnan Province, Pu’er, Jingdong County, Taizhong Town, Ailaoshan, E 100°51′30′′, N 24°25′42′′, elev. 1800 m, on the fallen branch of angiosperm, 4 October 2017, CLZhao 3802 (SWFC!), GenBank No. (ITS OP901840); Chuxiong, Zixishan Forestry Park, E 101°24′06′′, N 25°03′60′′, elev. 2100 m, on the trunk of angiosperm, 1 July 2018, CLZhao 7168 (SWFC!), GenBank No. (ITS OP901838).
Notes: Resupinatus alboniger (Pat.) Singer, Beih. (1977: 17), R. cinerascens (Cleland) Grgur.(1997: 47), R. hyalinus (Singer) Thorn, Moncalvo & Redhead (2006: 1148) and R. vinosolividus (Segedin) J.A. Cooper (2012: 1) resemble R. yunnanensis by having the elliptical basidiospores. However, Resupinatus alboniger is distinguished from R. yunnanensis by the brown hymenophore and irregular finger-like cystidia (23–35 × 8–10 µm) (Gonou-Zagou et al. 2011); R. cinerascens differs in R. yunnanensis by having the grayish black hymenophore and diverticulate branching cystidia (19–35.5 × 2.5–6 µm) (Mcdonald 2015); R. hyalinus is separated from R. yunnanensis by having the surface hairs and finger-like cystidia (Mcdonald 2015); R. vinosolividus differs from R. yunnanensis by having the cheilocystidia at edge of basidiomata on top surface of gills (Mcdonald 2015).
Resupinatus yunnanensis resembles R. applicatus (Batsch) Gray (1821: 617), R. huia (G. Cunn.) Thorn, Moncalvo & Redhead (2006: 1148), R. incanus (Kalchbr.) Thorn, Moncalvo & Redhead (2006: 1148) and R. poriaeformis (Pers.) Thorn, Moncalvo & Redhead (2006: 1148) in having cupulate basidiomata. However, Resupinatus applicatus is different from R. yunnanensis by having the brown to black hymenophore with a lateral pseudostipe, diverticulate with finger-like cystidia and globose to subglobose basidiospores (Mcdonald 2015); R. huia can be delimited from R. yunnanensis by its simple septa generative hyphae and oblong basidiospores (Thorn et al. 2005); R. incanus differs from R. yunnanensis by grey to black basidiomata and oblong basidiospores (Thorn et al. 2005); R. poriaeformis is distinguished from R. yunnanensis by dark brown or grey basidiomata, diverticulate cystidia, and globose to subglobose basidiospores and tan to (Thorn et al. 2005).
description: Published as part of Yang, Yang, Li, Rong, Liu, Chaomao & Zhao, Changlin, 2023, Morphological and molecular identification for two new species of woodinhabiting macrofungi (Basidiomycota) from Yunnan-Guizhou Plateau, China, pp. 1-18 in Phytotaxa 591 (1) on pages 10-12, DOI: 10.11646/phytotaxa.591.1.1, http://zenodo.org/record/7784136