Tomentella aureomarginata H.S. Yuan, X. Lu & Y.C. Dai 2020
Index Fungorum number: IF555629; Facesoffungi number: FoF 05604
Holotype: CHINA, Liaoning Province, Huanren County, Laotudingzi National Nature Reserve, on rotten angiosperm wood debris, 21 October 2015, Yuan 10671 (IFP 019247, holotype), Yuan 10683 (IFP 019248).
Morphological description
Basidiocarps annual, resupinate, adherent to the substrate, pelliculose, without odour or taste when fresh, 1–1.5 mm thick, continuous. Hymenophoral surface smooth, golden brown to yellowish brown (5D7–5F5) and turning darker than subiculum when dry. Sterile margin often determinate, byssoid, ligher than hymenophore, golden brown (5D7). Rhizomorphs present in subiculum and margins, 15–35 μm diam; rhizomorphic surface more or less smooth; hyphae in rhizomorphs monomitic, undifferentiated, of type B, compactly arranged and uniform; single hyphae with both clamps and simple septa, thick-walled, unbranched, 3.5–4 μm, pale brown in KOH, cyanophilous, inamyloid. Subicular hyphae monomitic; generative hyphae clamped and rarely simple septate, slightly thick- to thick-walled, frequently branched, 2–4 μm diam, without encrustation, pale brown in KOH, cyanophilous, inamyloid. Subhymenial hyphae clamped and simple septate, thin-walled, frequently branched, 3.5–4 μm diam, without encrustation; hyphal cells short and not inflated, pale brown in KOH, acyanophilous, inamyloid. Cystidia absent. Basidia 20–45 μm long and 4–8 μm diam at apex, 3–4 μm at base, with a clamp connection at base, utriform, not stalked, sinuous, with transverse septa, pale brown in KOH and in distilled water, 4-sterigmate; sterigmata 2–7 μm long and 1.5–2 μm diam at base. Basidiospores slightly thick-walled, (6–)6.5–7(–7.5) × (5.5– )6–6.5(–7) μm, L = 6.72 μm, W = 6.26 μm, Q = 1.06–1.22 (n = 60/2), subglobose to bi- or tri-lobed 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 1 μm long.
Habitat: On rotten angiosperm wood debris.
Distribution: In China.
GenBank Accession: ITS: MK211744, MK211745; LSU: MK446339, MK878395.
Notes: Tomentella botryoides (Schwein.) Bourdot & Galzin has characteristics similar to T. aureomarginata, such as pelliculose and continuous basidiocarps, a byssoid sterile margin, the absence of cystidia, the presence of rhizomorphs and subglobose to bi- or tri-lobed basidiospores. However, T. botryoides differs from T. aureomarginata by having fuscous black, mouse grey or greyish sepia basidiocarps, more or less uniform subhymenial hyphal cells and clavate basidia (Kõljalg 1996; Daemmrich 2006). T. separata resembles T. aureomarginata by having continuous basidiocarps, a smooth hymenophoral surface, a byssoid sterile margin, clamped and simple septate hyphae, short and inflated subhymenial hyphal cells, the presence of rhizomorphs, the absence of cystidia, and slightly thick-walled basidiospores. But T. separata differs by the honey yellow to raw umber basidiocarps, clavate basidia and subglobose to bi-, tri- or quadra-lobed basidiospores.
Reference: Hai‑Sheng Yuan1,2· Xu Lu1,2 · Yu‑Cheng Dai3 ·
A basidiocarp of Tomentella aureomarginata (IFP 019247, holotype)
