Abstract
Cytological observations were made on gametangia of Bremia lactucae . In gametangia formed by crossing self-sterile, heterothallic isolates multiple associations of chromosomes were found at metaphase I of meiosis which are indicative of chromosomal structural hybridity. These are similar to observations reported for heterothallic Phytophthora spp. where the stability of the two compatibility types is thought to be dependent on reciprocal translocation. In gametangia of a self-fertile line, associations of five chromosomes were observed; self-fertility (secondary homothallism) appears to be due to the extra chromosome. The similarities with homothallic lines of P. drechsleri are discussed.
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