Abstract
A new polypore, Grammothelopsis subtropica, is described and illustrated based on three specimens collected in Guangdong and Hunan provinces, southern China. Macroscopically, the new species is characterized by an annual growth habit, resupinate basidiocarps with cream pore surface, and large pores (1–2 per mm); microscopically, it has a dimitic hyphal system with strongly dextrinoid and cyanophilous skeletal hyphae, and its basidiospores are ellipsoid to oblong-ellipsoid, thick-walled, slightly dextrinoid, slightly cyanophilous, and 12.7–15.2 × 4.9–5.9 μm. In addition, dendrohyphidia are abundant in dissepiments. An identification key to the worldwide species of Grammothelopsis is provided.
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