Mating types of Job's tears smut fungus, Ustilago coicis, isolated in Japan were examined. The smut spores germinated to form a three- or four-celled promycelium on PDA medium generally and basidiospore (sporidium) was developed from each cell. Sporidia grew well by budding on PDA medium. On water agar medium, however, dikaryotic infection hyphae or parasitic mycelia were formed directly. Two sets of 8 monosporidial isolates from 2 smut spores were identified to have each two mating types on PDA medium and on the compatible pairing of the isolates, dikaryotic infection hyphae were developed on PDA 3 to 4 h after mixing in pairs. Pathogenicity of the isolates was also observed at compatible pairing, but not at incompatible pairing.
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