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Abstract: Because of the frequency of anastomoses between hyphae of the same species, a multinucleate vegetative cell may contain nuclei derived from more than one parent mycelium. Such a condition is called heterokaryosis. It is clear that when a heterokaryotic cell divides, a redistribution of the nuclei may occur, so that the daughter cells may be genetically different from the parents. These cells then can give rise to mycelia with characteristics strikingly different from the rest of the culture. These differences could of course, be carried through or incorporated in the mature sporophore. Lambert (1) states, "The improvements of cultures through the combining of several single spore cultures seems to merit consideration . . . theoretically some advantage might be had from such a procedure through the complementary action of associated nuclei of different genotypes." This complementary action of course is what we have in our multispore cultures, and is probably why Kligman (2) can state, "Cultures grown from multispore strains are always fertile."
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