A new species of Sidera (Hymenochaetales, Basidiomycota) from tropical Asia Author Du, Rui Institute of Microbiology, PO Box 61, Beijing Forestry University, Beijing 100083, China Author Wang, Li School of Economics and Management, Beijing Forestry University, Beijing 100083, China Author Zhou, Meng Institute of Microbiology, PO Box 61, Beijing Forestry University, Beijing 100083, China Author Chen, Jiajia Jiangsu Polytechnic College of Agriculture and Forestry, Zhenjiang, Jiangsu, 212400, China text Phytotaxa 2019 2019-01-08 387 2 165 171 http://dx.doi.org/10.11646/phytotaxa.387.2.9 journal article 10.11646/phytotaxa.387.2.9 1179-3163 13724364 Sidera vesiculosa Rui Du & M. Zhou , sp. nov. ( Figs. 2–3 ) MycoBank no.:—MB 827068 Type:— SINGAPORE . Bukit Timah Nature Reserve, on rotten angiosperm wood, 19 July 2017 ( holotype , BJFC 025377). Etymology:— Vesiculosa (Lat.) : refers to vesicular cells which are swollen tips of hyphae. Basidiocarps :—Resupinate, annual, soft and waxy when fresh, soft corky when dry, up to 16 cm long, 8 cm wide, and around 3 mm thick at center. Pore surface snow white when fresh, becoming cream when dry; sterile margin narrow, fimbriate, thinning out, pores round, freely arranged, 7–9 per mm; dissepiments thin, entire; subiculum very thin to almost absent, less than 1mm thick; tubes concolorous with poroid surface, up to 3 mm long. Hyphal structure :—Hyphal system monomitic, generative hyphae bearing clamp connections, IKI–, CB –, all hyphae unchanged in KOH. Subiculum :—Generative hyphae hyaline, frequently branched, some branches distinctly swollen at tips, in shape globose, bottle-shaped or irregularly elongated, slightly winding, loosely interwoven, 2–3 μm in diameter; rosette-like crystals frequently present, 2.5–10 μm in diameter, some irregular rhomboidal crystals also present. Tubes :—Generative hyphae hyaline, thin-walled, frequently “eggplant-shaped” branched, interwoven, 2–3 μm in diameter; rosette-like and irregular rhomboidal crystals abundant. Cystidia present, hyaline, thin-walled, basally swollen, with a sharp or often hyphoid neck, 7.5–25 × 2.0–4.0 μm. Basidia barrel-shaped, hyaline, bearing four sterigmata and a basal clamp connection, 7.5–10 × 3.5–5.5 μm; basidioles in shape similar to basidia, but slightly shorter. FIGURE 3. Basidiocarps of Sidera vesiculosa (BJFC025377). Bar: 1 cm. Photo by Yu-Cheng Dai. Basidiospores :—Allantoid to lunate, thin-walled, smooth, with a one to a few small guttules, IKI–, CB –, (2.7–) 2.9–3.7(–3.8) × 0.6–1.0(–1.1) μm, L = 3.29 μm, W = 0.90 μm, Q = 3.17–4.1 (n = 60/2). Additional specimen examined ( paratype ): — SINGAPORE . Bukit Timah Nature Reserve, on rotten angiosperm wood, 19 July 2017 ( BJFC 025367).