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The way in which the dolipore apparatus contains hyphal damage, and the process of septal sealing have been studied in Corwlus versicolor using combined light and electron microscopy. The technique used allows the structure of septa in adjacent damaged and undamaged hyphae to be compared. The results show that septal sealing, following damage, is a two stage process. The first is the instantaneous plugging of the pore channel with electron-dense material. The second, beginning several minutes later, involves the detachment of the septal apparatus present in the ruptured compartment and a re-modelling of the septal swelling on the other side of the wall to give a permanent seal. The parenthesomes play no part in the plugging response.

Summary Various combinations of dikaryons and monokaryons of the wood‐rotting Basidiomycete Coriolus versicolor (L. ex Fr) Quél. were inoculated evenly spaced into Petri dishes containing 3% malt agar, or birch logs placed in a woodland site. The resulting patterns of colonization were similar to those found in natural populations of the fungus, with individual dikaryons present in discrete regions delimited by zones of mutual antagonism. Different dikaryons had similar growth rates and occupied approximately equal areas or volumes when inoculated simultaneously on to agar or into wood respectively. Simultaneous and sequential inoculation of sexually compatible monokaryons on to agar demonstrated that growth rate of the monokaryons and patterns of dikaryotization and nucleus migration between them are likely to be crucial determinants of the spatial distribution of dikaryons in a population. Monokaryons inoculated into logs in the field quickly became dikaryotized, and the resulting dikaryons contained diverse mating‐type factors indicating the presence of a heterogeneous spore rain.