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

Syn.:Tomentella nitellina Bourdot & Galzin 1924

Basidiome effused, soft membranaceous to pellicular, loosely adherent to separable, often detached from the substrate, up to 0.5 (0.8) mm thick.
Hymenophore becoming continuous, smooth, some parts fissured on drying, relatively compact, up to 0.1 mm thick, monostratified, brown or with a light reddish tint (7.5–10YR 6–5/4 to 7.5–10YR 4/3–4), sometimes with a pale greyish bloom.
Subiculum hypochnoid to tomentose or soft-fibrous, distinct, becoming thick, yellowish-brown to pale brown-cinnamon (7.5–10YR 6–5/4–6), more or less paler than the hymenial surface.
Margin abrupt and fertile or indefinitely thinning out, byssoid to araneous and sterile, concolour with the subiculum.
Rhizomorphs absent; not differentiated thin hyphal strands may be rarely present in subiculum.

Hyphal system monomitic; all hyphae with mostly fibulate primary septa; scattered simple septa may be present in subicular hyphae.
Subicular hyphae loosely interwoven, regular or almost so, (2.5) 3–6 (7) µm diam, occasionally with swollen segments up to 10 µm, with some simple anastomoses, with thin or thickening walls (0.3–0.8) µm, subhyaline to yellowish brown (golden brown).
Subhymenial hyphae scanty, (3) 3.5–6 (8) µm, mostly regular, thin-walled, subhyaline to yellowish-brown. Remains of basidia (immature or collapsed) may infrequently appear as intercalary hyphal swelling.
Cystidia absent.
Basidioles subclavate, ovoid to ventricose, large and distinct, (8) 9–16 (19) µm wide, subhyaline to yellowish.
Basidia ventricose to utriform, 45–75 (88) µm long, 9–13 (14) µm wide at top, (10) 13–17 (20) µm at the lower middle, narrowed at the base and frequently shortly peduncolate, subhyaline to pale yellowish brown, often with ochraceous content; (2) 4 sterigmata up to 6–8 (10) µm long and (1.5) 2–3 µm wide at the base.
Basidiospores with irregular to slightly lobed outline, echinulate, finely verrucose; (7.2) 8–[8.85]–9.8 (10.4) µm long; lateral face mostly irregularly ellipsoid to broadly ellipsoid or slightly 2-3-lobed, with a flattening adaxial side, (6.4) 6.6–[7.35]–8 (8.8) µm wide, Q = (1.05) 1.1–[1.21]–1.3 (1.4); frontal face normally ± isodiametric, irregularly subglobose to subovoid, rarely somewhat 3-4-lobed, occasionally almost star-shaped, (7) 7.4–[8.27]–9.2 (9.6) µm wide, Q = 1–[1.07]–1.14 (1.26); in polar face globose to irregularly globose; without guttulae, walls 0.4–0.8 µm, yellowish brown or ochraceous, concolour with hymenial elements in mass. Echinuli 0.3–0.6 (1) µm long and 0.5–0.8 (1.2) µm wide at the base, mostly blunt, obtuse, single or paired at the base or sometimes in groups of 2 to 5 over a low tubercle or wart. Apiculus toward the base of the spore, 1.2–2 (2.5) µm across, without a distinct hilum. Macrospores infrequent, not differentiated, 11–12 x 9–9.6 x 9.8–11 µm.

description: Elia Martini 

drawing: Elia Martini