A fungus causing false smut in the flowers of Murdannia keisak (Commelinaceae, Commelinales, Monocots) in Japan was morphologically identical to Ustilago aneilematis. The fungus infected ovaries of most flowers of host plants. Infected flowers were filled with yellow to orange thick-walled conidia that became olivaceous green at maturity. However, multilocus phylogenetic analysis of DNA sequences (18S, 28S, translation elongation factor 1α [TEF], the largest [RPB1] and the second largest [RPB2] subunit of RNA polymerase II) showed that the fungus belonged to the tribe Ustilaginoideae (Clavicipitaceae, Hypocreales, Ascomycota). Microscopic examination showed that the fungus developed conidia at the apex of conidiogenous cells, in contrast to other species in the Ustilaginoideae that develop conidia pleurogenously. A new genus, Commelinaceomyces, is formally proposed in the Ustilaginoideae to accommodate this fungus. Four species previously misplaced in Ustilago (Ustilaginales, Basidiomycota) are transferred to Commelinaceomyces, including the type of the genus, C. aneilematis, on Murdannia keisak. This is the first report of a clavicipitaceous species infecting host plants in the Commelinaceae.

在的花引起曲病真菌水竹叶属keisak在日本（鸭跖草科，鸭跖草目，单子叶植物）中的溶液形态相同黑粉aneilematis。真菌感染了寄主植物大多数花的卵巢。感染的花朵充满了黄色到橙色的厚壁分生孢子，成熟时变成了橄榄绿色。但是，对DNA序列（18S，28S，翻译延伸因子1α[ TEF ]，最大的[ RPB1 ]和第二大的[ RPB2RNA聚合酶II）的亚基显示该真菌属于Ustilaginoideae科（Clavicipitaceae，Hypocreales，Ascomycota）。显微镜检查显示，真菌在分生孢子细胞的顶端形成了分生孢子，而在伞形科的其他物种中，分生孢子的是分生孢子。一个新属，Commelinaceomyces，在Ustilaginoideae被正式提出，以适应这种真菌。先前在Ustilago中放错位置的四种物种（Ustilaginales，Basidiomycota）被转移到Commelinaceomyces，包括Murdannia keisak上的C. aneilematis属。这是锁虫科物种感染fect草科寄主植物的第一份报告。