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SUMMARY
Perithecia of Chaetomium trilaterale develop from single, uninucleate ascospores. Ascogonial coils are stalked and are initiated terminally from uninucleate cells of the vegetative hyphae. The uninucleate or binucleate cells of the ascogonium become surrounded by hyphal cells that develop from adjacent vegetative stalk cells. Growth of the ascocarp is caused by divisions and enlargement of cells surrounding the ascogonium. Meristematic cells in the apical region give rise to an ostiole lined with periphyses. No hymenial or lateral paraphyses are formed. The centrum cavity results from the deliquescence of pseudoparenchyma cells in advance of developing asci. The ascogenous hyphae form from the ascogonium and asci develop from croziers. The hymenial layer is restricted to the basal, central part of the centrum. The morphology of C. trilaterale is compared with species showing the C. brasiliense pattern of development.