Two new species of Arthrinium (Apiosporaceae, Xylariales) associated with bamboo from Yunnan, China

Arthrinium, a globally distributed genus, is characterized by basauxic conidiogenesis in its asexual morph, with globose to subglobose conidia, which are usually lenticular in side view and obovioid and brown to dark brown. The sexual morph develops multi-locular perithecial stromata with hyaline apiospores usually surrounded by a thick gelatinous sheath. Four Arthrinium species collected in Kunming, China, are described and illustrated in this paper. Based on the morphology and analyses of ITS sequence data, we introduce two new species of Arthrinium. Arthrinium garethjonesii and A. neosubglobosa spp. nov. are provided with descriptions of sexual morphs and compared with phylogenetically close taxa. Arthrinium hydei and A. hyphopodii are new records on their sexual morphs.