SUMMARY: Carbon and nitrogen sources were found to be necessary both for the germination and the associated swelling of the macroconidia of The swelling of the spores took place before the emergence of the germ tube and was measured by two methods. The spores were shown to have a mucilaginous covering, which affected the uptake of nutrients and into which glucose was absorbed by a physical process rather than by an enzymic one. Tritiated water was used to demonstrate that the swelling of the spores in the presence of a nitrogen source was due largely to water uptake and only in a small part to an increase in dry weight.


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