Abstract
Carbon dioxide is essential for germination and sporeling growth of Chaetomium globosum, probably for vegetative growth, and certainly for the production of perithecia. The characteristic forms assumed by sporelings, 24–120 hr. old, deprived of CO2, are described and illustrated. None of a large number of simple substances tested was able to replace CO2, but certain complex extracts (e.g. jute extract) could do so. The formation of perithecia has been examined by a technique which allows the effect of external additives to be studied. The pathways by which fixation of CO2 takes place have been investigated, and the role of CO2, in metabolism is discussed.
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