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Thelephora ferruginella (Bourdot & Galzin) Kõljalg, I. Saar & Svantesson 2024

Syn. : Tomentella ferruginella (Bourdot & Galzin) Svrcek 1958

Basidiome effused, finely granulose and discontinuous to tomentose, slightly felted and loosely adherent when fresh, adherent to detachable in small pieces when dry, up to 0.3 (0.5) mm thick.
Hymenophore mostly discontinuous, finely granulose, tufted, porulose, rarely becoming almost continuous and smooth, when young yellow to orange yellow (5YR 6–5/6 to 10YR 5/8), becoming reddish brown, rusty when old (5–10YR 3/4).
Subhymenium thin, indistinctly thickening.
Subiculum soft, araneous to hypochnoid, sometimes almost pellicular and separable from the substrate, becoming thick, soft membranaceous, dark brown, darker than the fertile area (10YR 4–3/2–3).
Margin indistinct, shortly thinning out, pruinose, araneous to porulose, normally concolour with the subiculum.
Rhizomorphs absent.

Hyphal system monomitic; hyphae with mostly fibulate primary septa.
Subicular hyphae 4–6 (6.5) µm, regular or almost so, with rather distant septa, normally branching at some distance from clamps, sometimes with short projections and rare localized thickening, some segments with simple or secondary septa, thick-walled, ochraceous to brown.
Subhymenial hyphae almost regular, 3–6 (8) µm, frequently branched from clamps and short-celled, with thin or thickening wall, soon thick-walled, light yellow to yellowish.
Cystidia absent.
Basidia narrowly clavate to cylindrical, sinuous, sometimes slightly utriform, (30) 40–60 (70) x 8–11 µm, in old parts with thickening wall, light yellow to yellowish; 4 sterigmata 6–8 x 2.5–3 µm.
Basidiospores with regular or rarely slightly sinuous outline, never lobed; frontal face broadly ellipsoid to ovoid; lateral face broadly ellipsoid to ellipsoid with slightly flattening adaxial side; polar face globose, (6.5) 7–9 (9.5) x 5.5–7.5 x 6.5–8 (8.5) µm, Q¹ = 1.1–1.3 (1.4), Q² = 1.05–1.25, echinulate, normally yellow or bright yellow, sometimes slightly more dull, almost ochraceous, with thickening wall (0.3–0.5 µm), mostly without guttulae; aculei 0.5–1.5 x 0.3–0.6 (0.8) µm, blunt to tapering, sparse.
Chlamydospores absent.
Incrustation: yellow, orange, red, brown to dark brown resinous matter and crystals may be present in water mounts and dissolving in KOH producing a yellowish diffusate.
Chemical reactions: IKI —. CB— or inconsistent. KOH—.

description: Elia Martini

drawings and photo: Elia Martini