Skeletocutis impervia Miettinen & A. Korhonen

Korhonen, Aku, Seelan, Jaya Seelan Sathiya & Miettinen, Otto, 2018, Cryptic species diversity in polypores: the Skeletocutisnivea species complex, MycoKeys 36, pp. 45-82 : 45

Skeletocutis impervia Miettinen & A. Korhonen sp. nov.

Holotype.

Uganda. Western Reg.: Kabale Dist., Bwindi Impenetrable National Park, indet. angiosperm wood, 18 Nov 2002 Ipulet F1104 (O 918073, isotype H 7017125).

Description.

Basidiocarps annual; half-resupinate; up to 6 mm thick; hard when dry, breaking apart neatly; pilei fleshy, protruding up to 5 mm; margin blunt; upper surface almost smooth, matted, white to cream coloured when young, turning ochraceous brown and finally blackish with age; context and subiculum whitish-cream to light greyish-brown; context up to 5 mm thick, zonate in longitudinal section with thin dark lines separating layers of growth; tube layer from up to 1 mm thick; pores (7 –)8–9(– 10) per mm.

Hyphal structure: skeletal hyphae in context 2.0 –3.2(– 4.1) µm wide, in subiculum (1.0 –)2.0–3.0(– 3.8) µm wide, in trama (1.0 –)2.0–3.5(– 4.9) µm wide, generative hyphae in trama 1.0-2.0 µm wide.

Basidiospores (2.8 –)2.9–3.1×0.5– 0.8 µm, L=2.97 µm, W=0.61 µm, Q’=(3.6–)3.8–6.0(– 6.2), Q=4.85, n=30.

Distribution and ecology.

The species is known only from the type specimen, collected from Bwindi Impenetrable National Park in Uganda where it was reportedly growing on rotting branches.

Etymology.

Impervius (Lat.), impenetrable; the species is morphologically indistinguishable from its kins.

Specimen examined.

UGANDA. Western Reg.: (holotype, see above).