The distribution of the two mating types in soil and among isolates from human infection was studied. Nine hundred thirty-nine soil isolates and 184 clinical isolates obtained from 13 states in which the organism is endemic were tested for their mating types. The ratio of + and –types among soil isolates was 1: 1, whereas among the clinical isolates there was a 7 (−): 1 (+) ratio. The mycelia of the – type converted to the unicellular form in vitro more readily than the + type.
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Kwon‐Chung et al. (1974) studied this question.