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Abstract
Phellinus gilvus was found to have an out-crossing, bifactorial (tetrapolar) mating system. Two types of heterokaryon formation were evident in intrabasidiome homokaryon-homokaryon pairings: 1) bidirectional nuclear migration resulting in the formation of a single heterokaryotic thallus, and 2) restricted nuclear migration with a heterokaryon formed only in the interaction zone between the paired homokaryotic colonies. The mating system of P. gilvus is multiallelic; pairings between homokaryotic isolates from different basidiomes were always compatible with bidirectional nuclear migration. One heterozygous locus had major effects on somatic incompatibility reactions among progeny from two studied fruiting bodies. This was supported by the observation that pairings among sets of heterokaryons composed of one common nonsibling nucleus and the other sib-related resulted in two somatic incompatibility groups, while pairings among sibling heterokaryons resulted in three groups. The sexual compatibility loci were separate from the somatic incompatibility loci and no linkage was found between them.