Japanese Fungi on Plants No.23 before next top

Cochliobolus miyabeanus (Ito & Kurib.) Drechs. ex Dastur [=Bipolaris oryzae (Breda de Haan) Shoem., B. leersiae (Atk.) Shoem., B. zizaniae (Nisikado) Shoem.]
Classification: Ascomycota, Locuoascomycetes, Dothideales, Pleosporaceae

Distributed mainly south from Kanto, the central part of Japan, causes leaf spot on Oryza, Leersia, Zizania, etc. Disperses by scattering conidia. Teleomorph has never been observed in nature.

Characteristics: Plant pathogen

 Teleomorph: Produced by paired culture on artificial media. Producing cylindrical asci in blackish brown pseudothecia. Hyaline to pale olive brown and filamentous ascospores of 235-648 x 4-9 um produced in coiled helix in asci.
 Anamorph: On pale brown to olive golden brown conidiophores,  producing conidia,  curved, pale brown to olive brown, cylindrical to fusiform, 63-153 x 14-22 um, hilum minute, with 6-14 pseudosepta.


Herbarium specimen in NIAES

Specimen No. Scientific name Host name Host scientific name Symptoms Geographical origin Collected date Collector
256-1-12 Cochliobolus miyabeanus  rice Oryza sativa Leaf spot Itabashi, Tokyo 1937.6.17
101-1-47 " " Horimatsu, Ishikawa 1943.7.27
101-1-51 " " Urawa, Saitama 1943 Kawamura, E.
101-1-52 " " Sakurajima, Chiba 1944.5.29 Asuyama, H.
101-1-48 " " Ujiie, Tochigi 1958.9.12  Tsuchiya, Y.
256-1-2 " " Shizuoka, Shizuoka 1973.10.3 Tominaga, T.

(Described by Tsukiboshi, T., NIAES, Microbial Systemtics Lab., 2003)

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