Temperature induced dimorphism in Microsporum gypseum.

The biochemical mutant of Microsporum gypseum requiring adenine shows characteristic dimorphism dependent upon temperature. At 37 degrees C it produces faviform aconidial colonies with spherical swollen cells similar to thin-walled chlamydospores. At 26 degrees C it yields the usual mycelium with conidia. Conversion of the faviform and mycelial forms is controlled by temperature and reversible.