Bojamyces repens (Harpellales) from exuviae of mayfly, a new record from Japan

Bojamyces repens (Harpellales, Legeiomycetaceae) was discovered from exuviae of Paraleptophrebia sp. (Ephemeroptera: Leptophlebiidae). Trichosporogenesis required at least 2 days from the accumulation of cytoplasm in generative cells to mature trichospores at 5 °C in exuviae, which were kept in a drop of water on glass slides. Each mature trichospore possessed a structure with different refraction than the cytoplasm and was considered as a spore body, including a holdfast substance for the next infection. This is the first record of this genus in Japan.