back

Thelephora donkii (Litsch.) Kõljalg, I. Saar & Svantesson 2024

Basidiome effused, when dry adherent, tufted to somewhat compact, up to 0.1 mm thick.
Hymenophore mostly discontinuous, granulose, in small parts becoming more continuous and smooth, when fresh "Drab gray, somewhat smoky" teste Donk in Litschauer (1941), when dry brown, 10YR 4/4 (3).
Subiculum almost lacking, araneous, indistinct from the fertile area.
Margin indeterminate, thinning out, pruinose to araneous.
Rhizomorphs absent.

Hyphal system monomitic; all hyphae with fibulate primary septa, scattered simple or adventitious septa may be present in subicular hyphae.
Subicular hyphae few, regular, 2–3 µm wide, with slightly thickening walls, subhyaline to pale yellowish brown.
Subhymenial hyphae regular, 2.5–4 µm diam, branched from clamps, thin-walled, hyaline to pale yellowish.
Cystidia absent.
Basidia clavate, sinuous, 35–45 (50) µm long, 6.5–7.5 µm wide at top, 5–7 µm at the lower middle, hyaline to pale yellowish, often with pale yellowish brown content; 4 sterigmata up to 6 µm long

and 1.4–2 µm wide at the base.
Basidiospores with regular outline or almost so, echinulate, without distinct guttulae (but indicated in the original diagnosis), yellowish-brown; (6.2) 6.4–[7.05]–7.6 (8) µm long; lateral face broadly ellipsoid,

(5.4) 5.6–[6.18]–6.8 (7) µm wide, Q = (1.03) 1.07–[1.14]–1.21 (1.23), adaxial side convex; frontal face mostly subglobose, isodiametric, (5.8) 6–[6.76]–7.4 (7.6) µm wide, Q = (0.97) 1.00–[1.05]–1.10 (1.13); in polar view globose. Aculei 0.8–1.6 µm long and 0.3–0.6 (0.8) µm wide at the base, terete, tapering, single or rarely paired at the base, mostly unevenly distributed.

Apiculus subcentral to lateral toward the base in side view, distinct, 1-1.6 µm across, inamyloid; hilum often distinct. 

description E. Martini from holotype

drawing: E. Martini