Molecular phylogeny and morphology of the genus Fuscoporia (Hymenochaetales, Basidiomycota) and reveal three new species of the F. ferrea group Author Chen, Qian 0000-0001-7355-714X College of Architecture and Urban Planning, Chongqing Jiaotong University, Chongqing 400074, China & College of Architecture and Urban Planning, Tongji University, Shanghai 200092, China Author Chen, Han https://orcid.org/0009-0001-8424-9916 College of Architecture and Urban Planning, Chongqing Jiaotong University, Chongqing 400074, China Author Luo, Cheng-Hang https://orcid.org/0009-0005-6059-6373 College of Architecture and Urban Planning, Chongqing Jiaotong University, Chongqing 400074, China Author Lai, Xiao-Hong 0000-0001-5393-4307 College of Architecture and Urban Planning, Chongqing Jiaotong University, Chongqing 400074, China text MycoKeys 2024 2024-11-25 111 21 40 journal article 305435 10.3897/mycokeys.111.126446 bf3218c6-e769-4797-8447-df5d8c57f322 Fuscoporia resupinata Q. Chen sp. nov. Figs 4 , 5 Holotype . China • Yunnan Province , Pu’er , Taiyanghe National Forest Park , on dead angiosperm tree , 17 August 2019 , Dai 20455 ( BJFC 032123 ). Etymology. Resupinata (Lat.): refers to the species having resupinate basidiomata. Description. Basidiomata . Annual, resupinate, inseparable from the substrate, without odor or taste and corky when fresh, rigid when dry, up to 10.6 cm long, 4 cm wide and 1.2 mm thick at center. Pore surface fawn when fresh, snuff brown when dry; sterile margin indistinct, honey-yellow when dry, up to 1 mm wide, paler than color than the pore surface; pores circular to angular, 5–7 per mm; dissepiments thin, entire, abundant setae seen in tube cavities (under lens). Subiculum honey yellow, corky, about 0.2 mm thick. Tubes grayish brown, paler contrasting with pores, rigid, up to 1 mm long. Microscopic structures of Fuscoporia resupinata (holotype, Dai 20455) A basidiospores B basidia and basidioles C cystidioles D hymenial setae E generative hyphae at dissepiment edge F hyphae from tube trama G hyphae from subiculum. Hyphal structure . Hyphal system dimitic; generative hyphae simple septate; tissue becoming black in KOH. Subiculum . Generative hyphae infrequently, thin-walled, frequently branched, simple septate, 1–1.5 μm in diam; skeletal hyphae dominant, yellowish brown, thick-walled with a narrow to medium lumen, unbranched, aseptate, flexuous, strongly interwoven, 3–4 μm in diam. Basidiomata of Fuscoporia resupinata A Dai 20455 (holotype) B Dai 20422. Tubes . Generative hyphae infrequent, mostly present at subhymenium, hyaline, thin-walled, frequently branched, simple septate, 1–2 μm in diam; skeletal hyphae dominant, yellowish brown, thick-walled with a narrow to medium lumen, unbranched, aseptate, loosely interwoven, 2–5 μm in diam. Setae frequent, mostly originating from hymenium, subulate, dark brown, thick-walled, 20–30 × 5–7 μm; fusoid cystidioles frequent, hyaline and thin-walled, sometimes covered with crystals, 8–12 × 3.5–5 μm; basidia barrel-shaped, with four sterigmata and a simple septum at the base, 16–20 × 6–8 μm; basidioles in shape similar to basidia, but slightly smaller. Basidiospores . Basidiospores cylindric, hyaline, thin-walled, smooth, usually glued in tetrads, IKI –, CB –, sometimes with guttules, (5.4 –) 5.5–7 (– 7.2) × (2.4 –) 2.5–3 μm, L = 6.38 μm, W = 2.71 μm, Q = 2.29–2.44 (n = 60 / 2). Additional specimens examined. China • Yunnan Province , Xinping County , Longquan Park , on fallen angiosperm branch , 16 August 2019 , Dai 20422 ( BJFC 032090 ) . Malaysia • Selangor , Kota Damansara , Community Forest Reserve , on dead angiosperm tree , 7 December 2019 , Dai 21201 ( BJFC 032855 ) .