The taxonomic diversity of the genus Ulota in Asia is revised. Eighteen species (including two new species and two new records) are recognized in the region: U. crispa, U. curvifolia, U. delicata, U. drummondii, U. eurystoma, U. gigantospora, U. gymnostoma, U. japonica, U. latisegmenta, U. morrisonensis, U. perbreviseta, U. phyllantha, U. rehmannii, U. reptans, U. robusta, U. splendida, U. yakushimensis and U. yunnanensis. Ulota delicata and U. latisegmenta are new to science, U. rehmannii and U. yakushimensis are reported here for first time from China, and U. eurystoma and U. reptans are deleted from the Chinese flora. Ulota delicata, U. eurystoma, U. gigantospora, U. gymnostoma, U. latisegmenta, U. morrisonensis, U. reptans and U. yunnanensis are endemic to the area, while the remaining taxa are more widespread. Ulota hattorii is considered a synonym of U. splendida, and the occurrence of U. hutchinsiae and U. schmidii are still questionable because the type specimens are not located or too fragmental and the specimens upon which the former is reported from Asia are not available. Most species are common as epiphytes on trees, some occur also or exclusively on rocks. Observations from SEM-studies of peristomes and spores of U. crispa, U. curvifolia, U. delicata, U. drummondii, U. eurystoma, U. latisegmenta, U. morrisonensis, U. robusta, U. splendida and U. yakushimensis are presented.
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Vol. 115 • No. 3