Coenogonium hainanense sp. nov. and new records from China

A new species, Coenogonium hainanense, is proposed, characterized by its small slightly transparent pale yellow to brownish apothecia with plane to concave discs; slightly thick, not prominent, denticulate margins with short dense hairs; and uniseriate or irregularly biseriate, ellipsoid 1-septate ascospores (10–11.25 × 2.5–3.75 μm). Eight additional Coenogonium species reported as new to China are C. coronatum, C. curvulum, C. fallaciosum, C. geralense, C. hypophyllum, C. moniliforme, C. siquirrense, and C. usambarense. Descriptions and distributions of the new species and records are presented, and a key to the 20 Coenogonium species known from China is provided.