Tomentella inconspicua H.S. Yuan & Y.C. Dai 2020
Index Fungorum number: IF555702; Facesoffungi number: FoF 05629
Holotype: CHINA, Liaoning Province, Xifeng County, Binglashan National Forest Park, on rotten angiosperm branch, 2 August 2016, Yuan 11107 (IFP 019297, holotype); on rotten angiosperm wood debris, 1 August 2016, Yuan 11060 (IFP 019298); Huanren County, Laotudingzi Nature Reserve, on rotten angiosperm wood debris, 21 October 2015, Yuan 10684.
Morphological description
Basidiocarps annual, resupinate, adherent to the substrate, mucedinoid, without odour or taste when fresh, 0.1–0.2 mm thick, continuous. Hymenophoral surface smooth to granulose, dark brown (6F4–6) and concolorous with subiculum when dry. Sterile margin often indeterminate, byssoid, concolorous with hymenophore. Rhizomorphs present in subiculum, 10–20 μm diam; rhizomorphic surface more or less smooth; hyphae in rhizomorph monomitic, undifferentiated, of type B, compactly arranged and of uniform; single hyphae clamped, thick-walled, unbranched, 2–3 μm diam, brownish yellow in KOH, cyanophilous, inamyloid. Subicular hyphae monomitic; generative hyphae clamped, thick-walled, 4–6 μm diam, rarely branched, without encrustation, pastel yellow in KOH, cyanophilous, inamyloid. Subhymenial hyphae clamped, thin- to slightly thick-walled, frequently branched, 5–7 μm diam; hyphal cells more or less uniform, pastel yellow in KOH, cyanophilous, inamyloid. Cystidia absent. Basidia 30–50 μm long and 7–10 μm diam at apex, 5–8 μm at base, with a clamp connection at base, clavate, not stalked, not sinuous, without transverse septa, pastel yellow in KOH, yellow in distilled water, 4-sterigmate; sterigmata 3–5 μm long and 1–2 μm diam at base. Basidiospores thickwalled, (6–)6.4–7.3(–7.5) × (5–)5.3–6.8(–7) μm, L = 7.01 μm, W = 6.54 μm, Q = 1.05–1.13 (n = 60/2), irregularly globose or lobed in frontal and lateral views, echinulate, mustard yellow in KOH, mustard yellow in distilled water, cyanophilous, inamyloid; echinuli isolated or grouped in 2 or more, up to 1.5 μm long.
Habitat: On rotten angiosperm branch.
Distribution: In China.
GenBank Accession: ITS: KY686234, KY686235; LSU: MK446385, MK446384.
Notes: Tomentella badia resembles T. inconspicua by having brown, mucedinoid basidiocarps adherent to the substrate, a smooth to granulose hymenophore, indeterminate sterile margins, the absence of cystidia, and echinulate basidiospores with long echinuli. However, it differs from T. inconspicua by having simple septate hyphae, the absence of rhizomorphs, and bigger basidiospores (8–11 μm, Kõljalg 1996). T. parmastoana Suvi & Kõljalg is similar to T. inconspicua by having brown, continuous and mucedinoid basidiocarps adherent to the substrate, an indeterminate sterile margin, the presence of rhizomorphs, clamped, thickwalled subicular hyphae and echinulate basidiospores of approximately the same shape and size. But, it differs by a smooth to granulose hymenophoral surface, thick rhizomorphs (49–120 mm diam) and short, inflated subhymenial hyphae (Suvi et al. 2010).
Reference: Hai‑Sheng Yuan1,2· Xu Lu1,2 · Yu‑Cheng Dai3 ·
A basidiocarp of Tomentella inconspicua (IFP 019297, holotype)
