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''Tapesia yallundae''〔 〕 is the causal agent for a variety of cereal and forage grass diseases. The anamorph o f ''T. yallundae'' is the W-type strain of ''Pseudocercosporella herpotrichoides''. The R-type strain of ''Pseudocercosporella herpotrichoides'' is now known as ''Tapesia acuformis''. ==Morphology== Produces two types of mycelium - one vegetative, yellow-brown, linear, and branching, the other dark and stromalike. Condiophores are simple or sparingly branched. Conidia (1.5-3.5 x 37-70 μm) are hyaline, curved, and mostly five- to seven-celled. Sclerotia or sclerotialike stromatic mycelium, at first white to yellow-brown but later dark brown, may also be found on the lesions of infected plants.〔 〕 Black apothecia, 0.2 to 0.5 mm of diameter, form at the base of host culms. Apothecium contain cylindric to fusoid asci, of 35 to 38 µm x 5.9 to 7.4 µm. Ascospores are hyaline, fusoid, 0-1 septate, with a rounded end and an average size of 8.9 µm (7.4 to 10.3) x 2.07 µm (1.95 to 2.34).〔 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Tapesia yallundae」の詳細全文を読む スポンサード リンク
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