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Thelephora eucoerulea Kõljalg, I. Saar & Svantesson 2024 ss. orig.

Syn.: Tomentella molybdaea Bourdot & Galzin 1924?

Basidiome: effused, adherent, up to 0.2 mm thick
Hymenophore: discontinuous to continuous, becoming strongly granulose, smooth parts almost absent; when fresh mostly bluish grey, lilac, dark blue
Margin: indefinitely or shortly thinning out, pruinose, concolour to slightly paler than the fertile surface, down to whitish when fresh
Rhizomorphs: absent
Subiculum: indistinct, poorly developed, araneous, loose

Subicular hyphae: regular or almost so, sinuous, (2) 2.5–5 (6) µm diam, normally branching at some distance from septa, walls 0.4–1 µm thick, subhyaline to pale-light yellowish brown

Subhymenial hyphae: regular or almost so, short-celled, becoming compactly arranged and indistinct, (2) 2.5–5 (6) µm wide, often branching from clamps, thin-walled, subhyaline to yellowish, some with ochraceous content

Cystidia: absent
Basidia: narrowly clavate, subcylindrical, slightly utriform, (28) 31–48 (57)µm long, 6–9 µm wide at top, (4.2) 4.5–7 (8) µm at the lower middle, transverse septa frequent, hyaline to yellowish, sometimes with light ochre or brownish content. (2) 4 sterigmata 5–7 µm long and 1.2–2.5 µm wide at the base
Spores: almost regular to irregular, occasionally more or less lobed, echinulate, crowns absent or rare and indistinct, rarely with a large guttula, with thickening walls (0.5 µm), yellowish to ochraceous or light yellowish brown; (5.6) 6.2–7.6 (8) µm long; lateral face ellipsoid to broadly ellipsoid, sometimes irregular to somewhat 2-3-lobed dorsally, adaxial side flattening, (4.5) 4.8–6 (6.4) µm diam, Q = 1.1–1.4; frontal face triangular to broadly ovoid, sometimes faintly 3-lobed, (5.4) 5.6–7 (7.2), Q = 1–1.2; in polar view globose to irregularly globose. Aculei 0.5–1.3 (1.5) µm long,

Chemical reaction: Hymenium strong cyanescent with KOH

Distribution: considered a rare species in Germany

Description, Drawing and Photo: E. Martini