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SUMMARY
The small, dark sclerotia of Pyronema domesticum form in abundance in potato dextrose agar cultures, and originate when certain hyphae undergo the progressive and simultaneous processes of bulging, branching, and coiling. Individual cells are formed by septa delimiting each bulge, and maturation follows. The mature sclerotium consists of three distinct zones, an outer one of partially collapsed cells, the rind or cortex, and the medulla.