Inonotus niveomarginatus and I. tenuissimus spp. nov (Hymenochaetales), resupinate species from tropical China

Two new species are described from tropical Yunnan, southwestern China. Inonotus niveomarginatus is characterized by resupinate basidiocarps with distinct white margins, a monomitic hyphal structure, absence of hymenial and hyphoid setae, and yellowish, thick- walled, ovoid to subglobose basidiospores. Inonotus tenuissimus can be distinguished from other Inonotus species by the combination of resupinate habit, a mono- to dimitic hyphal structure, absence of the hymenial and hyphoid setae, and yellowish thickwalled ellipsoid basidiospores.