The Production of Asexual Spores by Pleurotus Corticatus

SUMMARY1. The production of asexual spores by Pleurotus corticatus Fries is described.2. The formation of conidia on coremia is described for an agaric for the first time, as far as the writer is aware.3. Binucleate conidia are formed in coremia on normal sporophores, if the sporophores are placed in a humid chamber while still fresh; upon abnormal or aborted sporophores; and upon the dicaryotic vegetative mycelium when the fungus is grown upon a nutrient medium.4. Simple binucleate conidia are formed singly at the tips of small conidiophores on the dicaryotic mycelium when the fungus is grown under adverse conditions.5. Uninucleate conidia are formed on coremia on the haploid mycelia derived from single basidiospores.6. Simple uninucleate conidia are formed singly at the tips of small conidiophores on the haploid mycelium when the fungus is grown under adverse conditions.7. Fairly large sporophores of the fungus may be produced on a medium composed of basswood sawdust and malt extract. Basidiospores from such sporophores do not germinate very readily.8. From tests with the few haploid lines obtained it has been established that the fungus is heterothallic.