Abstract
The spores of Spinellus macrocarpus , a parasite of agarics in nature, do not normally germinate unless stimulated. They germinated when placed on the surface of various basidiomycete fruit-bodies and in extracts of Polyporus squamosus , but not in extracts of other fungi tested, though these included some potential hosts. Various pure substances, ascorbic, arabo-ascorbic and gluconic acids, were effective in stimulating germination. The evidence suggests that ascorbic acid is present in agaric fruit-bodies and diffuses out, stimulating spores to germinate on the surface, but becomes oxidized and loses its activity when extracts are prepared. Extracts of P. squamosus are thought to contain another more stable, active substance in addition to ascorbic acid, but the identity of this substance has not so far been established.
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