Fomitiporia lagerstroemiae X.H. Ji, X.M. Tian & Y.C. Dai.
Index Fungorum number: IF555461; Facesoffungi number: FoF04972
Basidiocarp perennial, resupinate, inseparable, without odour or taste when fresh, consistency woody hard, light in weight when dry, up to 5 cm long, 3 cm wide and 8 mm thick at centre, becoming more or less cushion-shaped with age; margin receding, dark brown, up to 2 mm wide. Pore surface snuff brown when dry, distinctly shining; pores circular, 7–9 per mm; dissepiments thin and entire. Subiculum brown, very narrow to almost lacking. Tubes concolorous with pore surface, stratified, up to 8 mm long. Hyphal system dimitic in all parts; generative hyphae simple septate, skeletal hyphae negative in Melzer’s reagent, acyanophilous in Cotton Blue; tissue darkening but otherwise unchanged in KOH. Subicular generative hyphae infrequent, hyaline to pale yellowish brown, thin- to slightly thick-walled, occasionally branched, simple septate, 2.5–4 μm in diam.; skeletal hyphae yellowish brown, thick-walled, with a wide lumen, unbranched, loosely interwoven, 3–4.5 μm in diam.Tramal generative hyphae hyaline to pale yellow brown, thin- to slightly thick-walled, occasionally branched, frequently simple septate, 2.5–3 μm in diam.; skeletal hyphae yellowish brown, thick-walled, with a narrow to medium size lumen, rarely branched, interwoven, 3–4 μm in diam. Hymenial setae frequent, ventricose, thick-walled, dark brown, 15–22 × 5–7 μm; cystidioles absent, basidia barrel-shaped, with a basal simple septum and four sterigmata, 9.5–11.5 × 6.5–9 μm; basidioles in shape similar to basidia, but slightly smaller. Basidiospores subglobose, hyaline, thick-walled, smooth, dextrinoid in Melzer’s reagent, cyanophilous in Cotton Blue, (4.8–)5–6(–6.2) × (4–)4.5–5.5(–6) μm, L = 5.86 μm, W = 5.13 μm, Q = 1.14 (n = 30/1).
Material examined: VIETNAM, Dong Nai Province, Dinh Quan District, Thac Mai Preservation Park, on stump of Lagerstroemia, 14 Oct 2017, Dai 18335 (BJFC 025858, holotype).
Notes: Fomitiporia lagerstroemiae is similar to Fomitiporia hainaniana B.K. Cui & Hong Chen in sharing perennial, resupinate, basidiocarps, the approximately the same size pores, the presence of hymenial setae, interwoven tramal hyphae and occurring in tropical forests (Chen and Cui 2017). However, Fomitiporia hainaniana has smaller basidiospores (4–5 × 3.8–4.4 μm), and grows on angiosperm wood rather than Lagerstroemia (Chen and Cui 2017). The phylogentic analysis of ITS and LSU sequence (Fig. 1) shows that Fomitiporia lagerstroemiae is closely related to Fomitiporia bannaensis Y.C. Dai, and both species has perennial, resupinate, basidiocarps, the approximately the same size pores and hymenial setae. However, Fomitiporia bannaensis has smaller basidiospores (4.2–5.2 × 3.8–4.9 μm, L = 4.68 μm, W = 4.24 μm), the presence of cystidioles (Dai 2010).