Tomentella megaspora H.S. Yuan, X. Lu & Y.C. Dai 2020
Index Fungorum number: IF555751; Facesoffungi number: FoF 05635
Holotype: CHINA, Jilin Province. Changbaishan Nature Reserve, on fallen angiosperm branch, 7 August 2016, Yuan 11326 (IFP 019307, holotype); 10 August 2016, Yuan 11472 (IFP 019308).
Morphological description
Basidiocarps annual, resupinate, adherent to the substrate, pelliculose, without odour or taste when fresh, 0.5–0.8 mm thick, continuous. Hymenophoral surface smooth, brown to dark brown (6E8–6F8) and concolorous with subiculum when dry. Sterile margin often indeterminate, byssoid, concolorous with hymenophore. Rhizomorphs absent. Subicular hyphae monomitic; generative hyphae clamped, thick-walled, frequently branched, 5–9 μm diam, without encrustation, pale brown in KOH, cyanophilous, inamyloid. Subhymenial hyphae clamped, thin-walled, occasionally branched, 6–9 μm diam, without encrustation; hyphal cells short and inflated, pale brown in KOH, acyanophilous, inamyloid. Cystidia absent. Basidia 10–50 μm long and 3–12 μm diam at apex, 5–7 μm at base, with a clamp connection at base, utriform, not stalked, sinuous, without transverse septa, pale brown in KOH and in distilled water, 4-sterigmate; sterigmata 3–5 μm long and 1–1.5 μm diam at base. Basidiospores thick-walled, (8–)9–11(–11.5) × (7.5– )8–10(–11) μm, L = 9.88 μm, W = 9.08 μm, Q = 1.08–1.12 (n = 60/2), globose to subglobose in frontal and lateral views, echinulate, pale brown in KOH and distilled water, cyanophilous, inamyloid; echinuli usually isolated, sometimes grouped in 2 or more, up to 2.5 μm long.
Habitat: On fallen angiosperm branch.
Distribution: In China.
GenBank Accession: ITS: MK211724, MK211725; LSU: MK446395, MK446396.
Notes: Tomentella longiaculeifera is similar to T. megaspora by the byssoid sterile margin, clamped subicular and subhymenial hyphae, short and inflated subhymenial hyphal cells, globose to subglobose basidiospores and the absence of rhizomorphs and cystidia. However, T. longiaculeifera differs from T. megaspora by having mucedinoid basidiocarps, clavate basidia, and encrusted subicular hyphae which are occasionally collapsed. T. changbaiensis resembles T. megaspora by the byssoid sterile margin, clamped hyphae, short and inflated subhymenial hyphal cells, utriform basidia, globose to subglobose basidiospores and the absence of rhizomorphs and cystidia. However, T. changbaiensis differs from T. megaspora by having arachnoid basidiocarps with pale brown sterile margin and duplex subiculum.
Reference: Hai‑Sheng Yuan1,2· Xu Lu1,2 · Yu‑Cheng Dai3 ·
A basidiocarp of Tomentella megaspora (IFP 019307, holotype)
