Japanese Fungi on Plants No.66 before next top

Ustilago avenae (Pers.) Rostr.
  Classification: Basidiomycota, Ustilaginomycetes, Ustilaginales, Ustilaginaceae

 Widely distributed in Japan. Causes loose smut in oat and infecting other gramineous plants, tall oat grass, for example. Destroys all the floral parts, producing dark brown smut spores and dispersing by scattering them. Grows by budding of sporidia like yeasts on synthetic media.

Characteristics: Plant pathogen

Morphology:
 Smut spores globose to subglobose, yellow brown to olive brown, 4-7 x 6-9 um in size with minutely echinulate surface. Producing oval to cylindrical sporidia on basidia at germination.

smut spores

Herbarium specimen in NIAES

Specimen No. Scientific name Host name Host scientific name Symptoms Geographical origin Collected date Collector
104-1-7 Ustilago avenae Oat Avena sativa Loose smut
104-1-8 " " " " Chiba, Chiba 1962.6.21 Tominaga, T.

(Described by Tsukiboshi, T., NIAES, Microbial Systemtics Lab., 2002)


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