Apothecia of Tapesia yallundae were collected from a set‐aside straw stubble site in Lincolnshire in March 1993. Single ascospore isolates were obtained which produced colonies with morphologies and growth rates characteristic of the R‐pathotype of Pseudocercosporella herpotrichoides. Isolates were confirmed to be R‐type by the use of randomly amplified polymorphic DNA (RAPD) markers. These observations confirm that T. yallundae is the teleomorph of the R‐type of P. herpotrichoides and represent the first detection of the sexual stage of the R‐type in the UK.
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Dyer et al. (1994) studied this question.
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