THE MATING SYSTEMS OF FUNGI I

摘要: Summary Isolations of Mycocaha denudata and M. duriaeana were grown in plate culture their mating systems studied. The former species is heteromictic shows both bipolar diaphoromixis facultative homo-heteromixis, the latter almost certainly homomictic. None these have been found before Nidulariales. It suggested that abundance, morphological variation ecological tolerance may be related to kinds system. Facultative homo-heteromixis results spores being produced a single peridiolum which are either homocaryotic or heterocaryotic respect mating-type factors. condition due dominant gene Pd determines precocious division four nuclei, formed by normal meiosis, each basidium. eight nuclei so appear migrate at random, factors they carry, into basidiospores ultimately binucleate. This mechanism not yet known other Basidiomycetes. Isolations fell two groups (I II) between there was complete sterility but no constant distinguishing features could observed them. occurrence such thought significance fungi present it seems best regard them as comparable sibling species. Four identified amongst six isolations group I, seven sixteen II. Estimates total numbers I II twelve thirteen respectively. Thus, like Nidulariales, appears only relatively small number relation this inbreeding dispersal mechanisms discussed.