The comparative study of the responses of 22 strains of Emmonsia to different temperatures between 5 degrees and 40 degrees C allowed us to confirm the existence of thermophilic and non-thermophilic strains. 11 strains composed a very homogeneous non-thermophilic group: their growth, maximal at 20-25 degress C was almost completely inhibited above 30 degrees and they produced characteristic adiaspores at 35 degrees. The remaining 11 strains composed a thermophilic group: their growth was maximal at 25 degrees except for 57 (30-35 degrees), the growth of U.A.M.H. 139 was inhibited at 35 degrees, the others were inhibited at 40 degrees except for three which still continued to develop slowly. Microscopically they produced more or less degenerate chlamydospores at 40 degrees and few adiaspores.
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