Name: Abundisporus roseoalbus
Author: (Jungh.) Ryvarden
Citation: Belg. Jl Bot. 131(2): 154 (1999) 1998
Abundisporus roseoalbus (Jungh.) Ryvarden, Belg. J. Bot. 131:154 (1999). Figs. 3h, 8
Basionym: Polyporus roseoalbus Jungh.
Fruitbody. Basidiocarps perennial, pileate, becoming hard corky upon drying. Pilei applanate to slightly conchate, projecting up to 2.5 cm, 4 cm wide and 1.5 cm thick at base. Pileal surface clay-buff to umber-brown; margin acute, pale brown. Pore surface pale, pinkish to buff when fresh, pinkish buff to greyish brown drying; pores round, 5–7 per mm; dissepiments thin, entire. Sterile margin narrow, greyish brown, up to 1 mm wide. Con- text clay-buff to orange-brown, soft corky, up to 3 mm thick. Tubes concolorous with pore surface, corky, up to 1.2 cm long.
Hyphal structure. Hyphal system dimitic; generative hy- phae with clamp connections; skeletal hyphae dextrinoid, CB+; tissues becoming brown in KOH.
Context. Generative hyphae infrequent, hyaline, thin- walled, usually unbranched, 2–3 μm in diameter; skeletal hy- phae dominant, yellowish brown, thick-walled with a narrow to wide lumen, unbranched, slightly flexuous, interwoven, 3.5–5 μm in diameter.
Tubes. Generative hyphae infrequent, difficult to find, hy- aline, hyaline, thin-walled, usually unbranched, 2–3.5 μm in diameter; skeletal hyphae dominant, yellowish brown, thick- walled with a narrow to wide lumen, unbranched, slightly flexuous, interwoven, 3–4 μm in diameter. Cystidia absent, but cystidioles present, narrowly fusoid to subulate, thin- walled, smooth, 8–10 × 1.5–2.5 μm; basidia barrel-shaped to pear-shaped, with four sterigmata and a basal clamp connec- tion, 9–15 × 4.5–7.5 μm; basidioles dominant, in shape similar to basidia, but slightly smaller.
Spores. Basidiospores ellipsoid, yellowish, slightly thick- walled, smooth, non-dextrinoid, CB–, (3.5–)3.7–4.2(–4.5) × (2–)2.3–3(–3.2) μm, L = 3.91 μm, W = 2.49 μm, Q = 1.39– 1.53 (n=120/4).
Type of rot. A white rot.
Specimens examined: CHINA. Hainan Prov., Ledong County, Jianfengling Nature Reserve, on fallen angiosperm trunk, 12 May 2009 Cui 6650 (BJFC); Yunnan Prov., Jinghong County, Sanchahe Nature Reserve, on fallen angio- sperm trunk, 7 June 2011 Dai 12269, 12272 (BJFC). COLUMBIA. Magdalena, Sierra Nevada de Santa Marta, Reaerba Forestal San Lorenzo, 9 September 1985 Ryvarden 16140 (HUC). CUBA. Orientali, on dead wood, 1 July 1856 Wright 165 (type of Polyporus subflexibilis in FH). TANZANIA. Tanga Prov., Tanga District, Usambara Montains, on dead deciduous wood, 18 February 1973 Ryvarden 10737 (HUC).
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