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

Syn.: Tomentella testaceogilva Bourdot & Galzin 1924

Basidiome effused, adherent, tomentose to soft membranaceous, up to 0.3 (0.5) mm thick.
Hymenophore shallowly tuberculate, on drying becoming smooth, somewhat crustose and rather firm.
Hymenial surface continuous, slightly reticulate to smooth, at first very pale brown to light yellowish brown (10YR 7–6/4), rarely slightly darker (10YR 5/4), often assuming a rosy or faint purplish hue.
Subhymenium strongly thickening, compact in older parts, mostly yellowish brown to brown (10–5YR 6-5/3), slightly to distinctly darker than the fertile surface.
Subiculum often poorly developed, up to 30 (50) µm thick, araneose to hypochnoid, paler than the fertile area in young parts, then concolour with the subhymenium.
Margin mostly fertile throughout, abrupt or thinning out, pruinose to araneose or somewhat byssoid to fibrillose, paler to concolour with the fertile area.
Rhizomorphs present in subiculum, rarely at the margin; rather loose in subiculum to hard and rigid in substratum, yellowish to yellowish brown, up to 0.1 (0.3) mm in diam.

Hyphal system monomitic.
Subicular hyphae regular to slightly irregular and sinuous, mostly fibulate but as a rule with simple-septate segments, (2) 2.5–6 (7) µm in diam., with thin to thickening wall, smooth, subhyaline to pale yellowish brown or pale brown.
Subhymenial hyphae regular to slightly irregular, sometimes slightly swollen at the ramifications, fibulate, 3–6 (8) µm wide, thin-walled, often branching from clamps, hyaline, subhyaline to pale yellowish brown.
Rhizomorphs when young built up by hyphae like the subicular ones, rather loosely arranged, mostly straight, regular, fibulate, sometimes with simple septa, (2.5) 3–6 µm wide, often very long-celled, branching at some distance from septa, sometimes with simple anastomosis, with thin to thickening walls, hyaline to subhyaline; well developed rhizomorphs with outer hyphae becoming more thick-walled and with numerous simple septa, pale yellowish brown; slightly wider hyphae in the core, up to 8 (10) µm broad, sometimes with localized thickenings, mostly hyaline to subhyaline or with pale yellowish brown content.
Cystidia absent.
Basidia utriform to subcylindrical and slightly sinuous, 45–60 (80) x 8–11 (12) µm (apex), 8–12 (13) µm (lower half), with a fibulate basal septum; 4 sterigmata up to 6 µm long.
Basidiospores mostly well lobed in all views, (8) 8.5–10 (11) x (6) 6.5–7.5 (8) x 7–9 (10) µm, echinulate to mostly aculeate, pale yellowish-brown, only slightly darker than other elements; aculei up to 2.5 (3) µm long, single, sparse, tapering.
Chlamydospores absent.
Incrustation: none or some sparse granular hyaline crystals on subicular hyphae and rhizomorphs.
Chemical reactions: IKI–; CB: hyaline to subhyaline hyphae and young basidiospores more or less distinctly cyanophilous; KOH: hymenophore slightly darkening, context and subiculum often distinctly darkening but no appreciable reaction visible in squash mounts.

description: Elia Martini

 drawing: Elia Martini