Abstract
SUMMARY1. Peniophora Allescheri Bres. is genetically heterothallic.2. Oedocephaloid conidiophores are produced on haploid and diploid mycelia. Conidia are uninucleate in both cases, those on the haploid mycelium repeating the haploid generation, those on the diploid mycelium giving rise to haploid mycelia of the two parental types, as determined by ability to react to form clamp-bearing mycelium.3. A mutant in the haploid has appeared which differs from the normal haploid mycelium in type of growth and in its inability to produce conidia.4. Mating this non-conidial mutant with a suitable normal haplont produces a diploid colony which reveals characters of both parents and bears conidia which when grown separately give rise to colonies, in equal numbers, having the characteristics of the two parents.
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