Skeletocutis unguina 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 unguina Miettinen & A. Korhonen sp. nov. Figure 4F

Holotype.

China. Yunnan: Xishuangbanna, Xishuangbanna Biosphere Reserve, alt. 700 m, indet. angiosperm wood, 5 Aug 2005 Miettinen 10002 (H 7008668, isotype BJFC).

Description.

Basidiocarps annual; half-resupinate; small, up to 1 cm wide and 1 mm thick; hard when dry but easy to break apart; pilei thin, protruding up to 4 mm; margin incurved; upper surface minutely rough, matted, white to cream coloured when young, turning ochraceous; context up to 0.7 mm thick, azonate; tube layer up to 0.3 mm thick; pores 7-9 per mm.

Hyphal structure: skeletal hyphae in context 1.0 –2.9(– 3.5) µm wide, in subiculum (1.0 –)2.0–2.9(– 3.2) µm wide, in trama 2.0 –4.0(– 4.8) µm wide, generative hyphae in trama 1.0 –1.9(– 2.0) µm wide.

Basidiospores 2.9 –3.2(–3.3)×(0.4–)0.5–0.6(– 0.7) µm, L=3.04 µm, W=0.55 µm, Q’=(4.6–)4.8–6.4(– 7.5), Q=5.49, n=30.

Distribution and ecology.

The species is known only from the type specimen, collected from Yunnan, China, where it was growing as small individual pilei on thin twigs of unidentified woody angiosperm.

Etymology.

Derived from unguis (Lat.), claw, nail; refers to nail-like basidiome caps.

Specimen examined.

CHINA. Yunnan: (holotype, see above).