Skeletocutis calida 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 calida Miettinen & A. Korhonen sp. nov. Figure 7

Holotype.

U. S. A. Florida: Alachua County, Gainesville, indet. angiosperm wood, 20 Nov 2013 Miettinen 17761 (H 7008665, isotype FLAS).

Description.

Basidiocarps annual; half-resupinate; up to 1.5 cm wide and 2 mm thick; hard when dry but easy to break apart; pilei thin, protruding up to 5 mm; margin incurved; upper surface minutely rough, matted, white to cream coloured when young, turning ochraceous; context up to 1.5 mm thick, faintly zonate in longitudinal section with thin dark lines separating layers of growth; tube layer up to 0.5 mm thick; pores 8 –10(– 11) per mm.

Hyphal structure: skeletal hyphae in context / subiculum (1.0 –)2.0–2.9(– 3.5) µm wide, in trama (1.0 –)2.0–4.1(– 5.2) µm wide, generative hyphae in trama 1.0 –2.0(– 2.9) µm wide.

Basidiospores 2.5 –3.1(–3.3)×0.5–0.6(– 0.7) µm, L=2.86 µm, W=0.55 µm, Q’=(4.0–)4.3–6.0(– 6.9), Q=5.18, n=60/2.

Distribution and ecology.

The species is known only from two specimens from southern U. S. A., collected from warm temperate deciduous forests where specimens were growing on rather thin twigs of unidentified woody angiosperm.

Etymology.

Calidus (Lat.), warm, refers to the southern distribution.

Specimens examined.

U. S. A. Arkansas: Marion County, Yellville, indet. angiosperm wood, 25 Oct 2013 Miettinen 17466 (H, FLAS); Florida: (holotype, see above).