Spok Sk in P. anserina geographic races.

The table gives the percentage of 2-spored asci when crossed with the indicated strain. / means no progeny could be recovered due to sterility of the cross. CBS411.78 and CBS237.11 are labeled as P. comata in the Baarn collection, but are fully fertile when crossed with our P. anserina strains. PSCJ14 and PSN14 were recently isolated from nature (in 2003 and 2007, respectively). A406 was kindly obtained from D. P. Mahoney and A. E. Bell.1presence/absence of a PCR-amplification product when probed with Spok genes-specific primers.2number of nucleotide differences with the Spok genes of the S and T strains.3fertility of this cross is very low and few asci were obtained, all had only two ascospores.