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SUMMARY
Conidium ontogeny in the dematiaceous fungus, Cacumisporium capitulatum, was studied in culture. As the conidiophore matures, the heavy outer wall of the tapered conidiophore apex is broken and a hyaline meristematic area emerges. Conidia are produced from the hyaline meristematic region on successively produced growing points. The broken outer wall subtends the sporogenous area as a collarette. Previous interpretation of the conidiophores of C. capitulatum as a type of phialide is considered to be in error.