Tomentella separata H.S. Yuan, X. Lu & Y.C. Dai 2020
Index Fungorum number: IF555780; Facesoffungi number: FoF 05644
Holotype: CHINA, Liaoning Province, Huanren County, Laotudingzi National Nature Reserve, on fallen angiosperm trunk, 20 October 2015, Yuan 10664 (IFP019325, holotype); on fallen angiosperm branch, 20 October 2015, Yuan 10654 (IFP 019326).
Morphological description
Basidiocarps annual, resupinate, separable from the substrate, pelliculose, without odour or taste when fresh, 0.6–1.2 mm thick, continuous. Hymenophoral surface smooth, honey yellow to yellowish brown (5D6–5F8) and turning darker than subiculum when dry. Sterile margin often indeterminate, byssoid, concolorous with hymenophore. Rhizomorphs present in subiculum and margins, 5–45 μm diam; rhizomorphic surface more or less smooth; hyphae in rhizomorph monomitic, undifferentiated, of type B, compactly arranged and of uniform; single hyphae clamped and simple septate, thick-walled, unbranched, 2–4 μm, pale brown in KOH, cyanophilous, inamyloid. Subicular hyphae monomitic; generative hyphae clamped and rarely simple septate, thin- to slighty thick-walled, frequently branched, 1.5–3.5 μm diam, without encrustation, pale brown in KOH, acyanophilous, inamyloid. Subhymenial hyphae clamped and simple septate, thin-walled, frequently branched, 2.5–4.5 μm diam; hyphal cells short and inflated, pale brown in KOH, inamyloid. Cystidia absent. Basidia 15–55 μm long and 3.5–6 μm diam at apex, 2–3.5 μm at base, with a clamp connection at base, clavate, stalked, sinuous, with transverse septa, pale brown in KOH and in distilled water, 4-sterigmate; sterigmata 4–8 μm long and 1.5–2 μm diam at base. Basidiospores slighty thick-walled, (6.5–)7–8(–8.5) × (5.5– )6–7.5(–8) μm, L = 7.37 μm, W = 6.74 μm, Q = 1.08–1.25 (n = 60/2), subglobose to bi-, tri- or quadra-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 fallen angiosperm trunk.
Distribution: In China.
GenBank Accession: ITS: MK211737, MK211736; LSU: MK850196, MK850197.
Notes: Tomentella botryoides is similar to T. separata by the continuous basidiocarps, with byssoid sterile margin, the presence of rhizomorphs and the absence of cystidia. However, T. botryoides differs from T. separata by having fuscous black, mouse grey or greyish sepia basidiocarps, more or less uniform subhymenial hyphal cells and subglobose to bi- or tri-lobed basidiospores (Kõljalg 1996; Daemmrich 2006). T. brunneoflava resembles T. separata by having a byssoid sterile margin, the presence of rhizomorphs, clamped and simple septate hyphae, short and inflated subhymenial hyphal cells, clavate basidia, and the absence of cystidia. But, it differs by the brownish orange, arachnoid basidiocarps and subglobose to bi-, tri-lobed basidiospores.
Reference: Hai‑Sheng Yuan1,2· Xu Lu1,2 · Yu‑Cheng Dai3 ·
A basidiocarp of Tomentella separata (IFP 019325, holotype)
