Tomentella pallidomarginata H.S. Yuan, X. Lu & Y.C. Dai 2020
Index Fungorum number: IF555768; Facesoffungi number: FoF 05639
Holotype: CHINA, Jilin Province, Changbaishan Nature Reserve, on fallen angiosperm branch, 10 August 2016, Yuan 11474 (IFP 019315, holotype), 9 August 2016, Yuan 11404 (IFP 019316).
Morphological description
Basidiocarps annual, resupinate, adherent to the substrate, crustose, without odour or taste when fresh, 0.6–1.2 mm thick, continuous. Hymenophoral surface smooth, dark blonde to brown (5D4–6E4) and turning darker than subiculum when dry. Sterile margin often determinate, byssoid, paler than hymenophore, pale yellow (4A4). Rhizomorphs present at the margin, 30–50 μm diam; rhizomorphic surface more or less smooth; hyphae in rhizomorph monomitic, undifferentiated, of type A, loosely interwoven and uniform, several hyphae growing out of the margin; single hyphae clamped, thick-walled, occasionally branched, 5–6 μm diam, pale brown in KOH, cyanophilous, inamyloid. Subicular hyphae monomitic; generative hyphae clamped and rarely simple septate, slightly thick- to distinctly thick-walled, occasionally branched, 5–7 μm diam, without encrustation, pale brown in KOH, cyanophilous, inamyloid. Subhymenial hyphae clamped and rarely simple septate, thin- to slightly thick-walled, rarely branched, 5–9 μm diam; hyphal cells short and inflated, pale brown in KOH, cyanophilous, inamyloid. Cystidia absent. Basidia 20–70 μm long and 5–13 μm diam at apex, 4–8 μm at base, with a clamp connection at base, utriform, not stalked, sinuous, rarely with transverse septa, pale brown in KOH and in distilled water, 4-sterigmate; sterigmata 4–8 μm long and 2–3 μm diam at base. Basidiospores slightly thick-walled, (6.5–)7–8.5(–9) × (6–)6.5–7(–7.5) μm, L = 7.54 μm, W = 6.85 μm, Q = 1.07–1.13 (n = 60/2), subglobose to bi- to 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 1.5 μm long.
Habitat: On fallen angiosperm branch.
Distribution: In China.
GenBank Accession: ITS: MK211733, MK211732; LSU: MK446404, MK446403.
Notes: Tomentella ellisii is similar to T. pallidomarginata by having continuous basidiocarps adherent to the substrate, a smooth hymenophoral surface, the presence of rhizomorphs, short and inflated subhymenial hyphal cells, utriform basidia, the absence of cystidia, and subglobose to bi- or tri-lobed basidiospores. However, T. ellisii differs by its yellowish sterile margin and thin-walled subicular and subhymenial hyphae (Stalpers 1993; Kõljalg 1996). T. hjortstamiana Suvi & Kõljalg resembles T. pallidomarginata by having continuous basidiocarps adherent to the substrate, a smooth hymenophoral surface, the presence of rhizomorphs, short and inflated subhymenial hyphal cells, the absence of cystidia, and subglobose to bi- or tri-lobed basidiospores. However, the former species is differentiated by yellowish grey and arachnoid or mucedinoid basidiocarps, clavate basidia and thin-walled subicular and subhymenial hyphae.
Reference: Hai‑Sheng Yuan1,2· Xu Lu1,2 · Yu‑Cheng Dai3 ·
A basidiocarp of Tomentella pallidomarginata (IFP 019315, holotype)