新种 Cudonia （Cudoniaceae， Rhytismatales) from Yunnan, China based on morphological characteristics and phylogenetic analysis

The genus Cudonia in the family Cudoniaceae, is widely distributed in the temperate regions of the Northern Hemisphere, and has a limited distribution in subtropical regions. The main characteristic of this genus is that its ascocarps are rounded and club-shaped. In this study, a novel species and a known species of Cudonia from Yunnan, China are introduced, based on morphological and molecular phylogenetic analysis. Phylogenetic analysis based on sequence data from rDNA internal transcribed spacer (ITS). Cudonia cangshanensis is reported as a new species, and it is characterized by its stipe long clavate, slightly swollen at the base, clearly striated longitudinally at the upper part, the hymenium is relatively thick (`X = 162 μm), ascospores are relatively large (`X = 67 × 3.0 μm). In addition, a new collection Cudonia gracilistipitata from Dali Autonomous Prefecture has been record. New species and collection detailed description and illustrations are provided in this study.