Thelephora neobourdotii (M. J. Larsen) Kõljalg, I. Saar & Svantesson 2024
Syn.: Tomentella neobourdotii M.
J. Larsen 1968
Basidiome effused, adherent to separable in small pieces, tomentose,
up to 0.2–0.3 mm thick.
Hymenophore smooth to granulose, sometimes becoming finely colliculose, discontinuous to continuous, dark brown to
dark bluish or purplish brown.
Subiculum developed, hypochnoid to tomentose, dark brown to very dark brown, concolour to distinctly darker than the fertile area.
Margin not differentiated, fertile throughout, shortly thinning out, pruinose.
Rhizomorphs absent or present, infrequent and sometimes very difficult
to find, mostly present in subiculum, rarely well developed and then at the
margin and in cracks of the substratum, rather soft to compact, brown to
blackish.
Hyphal system monomitic or dimitic in rhizomorphs.
Subicular hyphae of two kinds: 1) numerous mostly regular, fibulate, 4–6.5 µm wide, ochraceous
to brownish, mostly thick-walled; 2) some simple-septate, regular, 2–4 µm wide,
very pale yellowish brown to brownish, thick-walled, sometimes simulating skeletoid hyphae.
Subhymenial hyphae regular, fibulate,
3–5 (5.5) µm wide, subhyaline to very pale brown,
with thin to thickening wall.
Rhizomorphs becoming structured; built up by 1) regular hyphae, fibulate, 4–6 µm wide, pale yellowish to pale brown, with
thickening or thick wall, larger and up to 10 (20) µm in the center of older rhizomorphs; 2) few to numerous straight
skeletal hyphae on surface, (1) 1.5–2 µm in diam.
Cystidia absent.
Basidia subcylindrical to
utriform, 30–45 x 7–9 µm, subhyaline to very pale
brown, often with ochraceous or brownish content; 4 sterigmata up to 4-6 µm long.
Basidiospores with slightly irregular to more
or less lobed outline, frontal face somewhat ovoid to slightly three-lobed,
6–7.5 x 5–6 x 5.5–6.5 µm, echinulate, yellowish brown to brownish; aculei up to 0.5 (1) µm long.
Incrustation: normally evident on subicular
hyphae, granular, subhyaline to yellowish brown; in
some specimens becoming slightly or distinctly gelatinized and then more
difficult to see.
Chemical reactions: IKI– ; KOH: elements
turning more or less darker, umbrinous.
description: Elia Martini
drawing: Elia Martini