Tomentella brunneogrisea H.S. Yuan, X. Lu & Y.C. Dai 2020
Index Fungorum number: IF555632; Facesoffungi number: FoF 05607
Holotype: CHINA, Liaoning Province, Qingyuan County, Experimental Station of Forest Ecology, on fallen angiosperm branch, 30 July 2017, Yuan 12147 (IFP 019253, holotype), Yuan 12146 (IFP 019254).
Morphological description
Basidiocarps annual, resupinate, adherent to the substrate, mucedinoid, without odour or taste when fresh, 0.8–1.5 mm thick, continuous. Hymenophoral surface granulose, brownish grey to dark brown (7E2–7F4) and concolorous with subiculum when dry. Sterile margin often indeterminate, farinaceous, concolorous with hymenophore. Rhizomorphs absent. Subicular hyphae monomitic; generative hyphae clamped and rarely simple septate, thick-walled, frequently branched, 4–9 μm diam, without encrustation, pale brown in KOH, cyanophilous, inamyloid. Subhymenial hyphae clamped and rarely simple septate, thin-walled, occasionally branched, 4–7 μm diam; hyphal cells short and not inflated, pale brown in KOH, acyanophilous, inamyloid. Cystidia absent. Basidia 10–50 μm long and 6.5–10 μm diam at apex, 4–6 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 8–10 μm long and2–3 μm diam at base. Basidiospores thick-walled, (7–)8– 9(–9.5) × (6.5–)7.5–8.5(–9) μm, L = 8.47 μm, W = 7.97 μm, Q = 1.04–1.08 (n = 60/2), globose to subglobose in frontal and lateral views, echinulate, pale brown in KOH and in distilled water, cyanophilous, inamyloid; echinuli usually isolated, sometimes grouped in 2 or more, up to 2 μm long.
Habitat: On fallen angiosperm branch.
Distribution: In China.
GenBank Accession: ITS: MK211751, MK211750; LSU: MK446343, MK446342.
Notes: Tomentella atrobadia is similar to T. brunneogrisea by the brownish grey to dark brown basidiocarps adherent to the substrate, short subhymenial hyphal cells, utriform basidia and the absence of rhizomorphs and cystidia. However, T. atrobadia differs from T. brunneogrisea by having crustose basidiocarps with a byssoid sterile margin, and thick-walled subhymenial hyphae. T. pertenuis and T. brunneogrisea share the following similar morphological and anatomical characteristics: mucedinoid basidiocarps adherent to the substrate, farinaceous and indeterminate sterile margin, utriform basidia, thick-walled basidiospores and the absence of rhizomorphs and cystidia. But, T. pertenuis has yellowish brown basidiocarps and slightly thick-walled subhymenial hyphae.
Reference: Hai‑Sheng Yuan1,2· Xu Lu1,2 · Yu‑Cheng Dai3 ·
A basidiocarp of Tomentella brunneogrisea (IFP 019253, holotype)
