Septobasidium wuliangshanense Q. Q. Jiang & C. L. Zhao 2024, sp. nov.

Septobasidium wuliangshanense Q. Q. Jiang & C. L. Zhao sp. nov. Figs 7, 8 Holotype. China • Yunnan Province, Pu’er, Zhenyuan County, Heping Town, Liangzi Village, Wuliangshan National Nature Reserve, 24°29'17"N, 100°40'27"E, altitude: 1860 m a. s. l., on the living tree of angiosperm, leg. C. L. Zhao, 15 January 2018, CLZhao 5809 (SWFC). Diagnosis. Differs from other Septobasidium species by the coriaceous basidiomata with a slightly brown surface, cylindrical or slightly irregular basidia, pyriform to subglobose or ovoid probasidia (7.5–13 × 4.5–9 µm), and the haustoria consisting of irregularly coiled hyphae. Etymology. Wuliangshanense (Lat.): refers to the locality (Wuliangshan) of the type specimen. Description. Basidiomata perennial, resupinate, easy to separate from substrate, coriaceous upon drying, up to 10 cm long, 2 cm wide, 1 mm thick. Hymenial surface smooth, cream to pale brown when fresh, slightly brown upon drying. Sterile margin cream to slightly brown, up to 2 mm. Hyphal system monomitic, generative hyphae with simple septa, pale brown, thick-walled. In section 660–1200 µm thick; subiculum pale brown, 20–50 µm thick; pillars brown, 150–300 µm high, 30–150 µm wide, hyphae of pillars 3–4 µm thick, brown, forming 2–3 horizontal layers. Basidia arising directly from the generative hyphae, cylindrical or slightly irregular, colourless, straight or slightly curved, 2-3 - celled, 21.5–29 × 5.5–9 µm. Probasidia pyriform, subglobose or ovoid, 7.5–13 × 4.5–9 µm, colorless, probasidia cell persistent after the formation of the basidia. Haustoria consisting of irregularly coiled hyphae. Basidiospores not seen. Habitat and distribution. Growing on the plant Fagaceae Dumort, associated with the insect genus Aulacaspis Cockerell. Additional specimen examined (paratype). China • Yunnan Province, Pu’er, Jingdong County, Wuliangshan National Nature Reserve, in association with the genus Aulacaspis on Rosaceae, 24°29'17"N, 100°40'27"E, altitude: 1800 m a. s. l., on the living tree of angiosperm, leg. C. L. Zhao, 2 October 2017, CLZhao 3666 (SWFC).