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Odontia ferruginea Pers. 1794                                                           

Syn.: Tomentella crinalis (Fr.) M. J. Larsen 1967

Basidiome effused, separable, hypochnoid, soft and fragile to tomentose, becoming membranaceous, up to 0.3 (0.5) mm thick.
Hymenophore mostly continuous, granulose to colliculose, dark yellowish brown to brown (10YR 4/3–6), normally becoming olive brown to dark olive (5Y 4–3/4).
Subhymenium rather thin, normally poorly developed.
Subiculum thin to well developed, yellow to yellowish brown, reddish-yellow, rarely brown, araneose to hypochnoid.
Margin indistinct, fertile throughout and shortly thinning out or distinct, almost sterile and indefinitely thinning out, finely byssoid to fibrillose, rarely somewhat fimbriate, yellow to yellow orange or yellowish brown, mostly concolour or paler than the subiculum.
Rhizomorphs common in subiculum where they can be readily seen on the underside, if the basidiome can be turned upside-down; often present and well developed in the substratum, especially if strongly decayed, and at the margin, up to 0.05 (0.1) mm, compact, hard and flexible, richly branched and often fan-shaped, slightly pilose or smooth between branchings, yellow to brown or very dark brown.

Hyphal system system monomitic to dimitic or trimitic with skeletal hyphae associated with rhizomorphs.
Subicular hyphae regular, mostly fibulate, sometimes with simple septa and repetitive adventitious septa, 2.5–5 µm wide, infrequently with some localized thickenings, thin-walled or with slightly thickening wall, subhyaline to yellowish.
Subhymenial hyphae regular, fibulate, 3–4 (5) µm wide, subhyaline to pale yellowish, sometimes with yellowish-ochraceus content.
Rhizomorphs starting as strands of fibulate and simple-septated thin-walled hyphae, 2–4 µm in diam. that later develop wider in the core (up to 10 µm) and mix with 1–3 µm wide hyphae with thickening wall, sparse clamps and frequent simple or adventitious septa, that originate straight skeletal hyphae common on the surface of the rhizomorphs; some old rhizomorphs may show also infrequent richly branched pseudoskeletal hyphae forming an incomplete labyrinthiform net on the surface. Rhizomorphs with numerous skeletal hyphae on surface are yellowish, otherwise brownish.
Cystidia absent.
Basidia subcylindrical or narrowly clavate to slightly utriform, infrequently capitate, sometimes more or less sinuous, 40–60 x 6.5–8 µm, with a fibulate basal septum, subhyaline to pale yellowish or ochraceous, often with yellowish to ochraceous content; (2) 4 sterigmata, 4–5 µm long and 1–1.5 µm wide at the base.
Basidiospores with regular to irregular or lobed outline, lateral face ellipsoid to broadly ellipsoid sometimes with a broader base, frontal face ovoid to 3-lobed, polar face globose, subglobose or slightly 3-lobed, (6.3) 6.5–8.3 (8.7) x (5.2) 5.5–6.5 x (6) 6–7.5 (8) µm, Q1 = 1.1–1.45, Q2 = 0.9–1.25, echinulate, yellow to ochraceous; aculei blunt to tapering, up to 0.8 (1.2) µm long, single and sparse, paired at the base or grouped on not well defined secondary lobes.
Chlamydospores absent.
Incrustation: sometimes with deposits of yellow to brown resinous matter in hymenium and subhymenium that dissolve in KOH.
Chemical reactions: IKI–. CB: very young basidiospores and some skeletal hyphae cyanophilous. KOH: subhymenial hyphae and basidia with content and adhering matter turning more or less distinctly greenish, olivaceous to very dark green, greyish green or even blackish with KOH.

description: Elia Martini

 

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drawing: Elia Martini