The identification of species of fungi isolated from ringworm is of importance to the dermatologist. In some instances it suggests the source of infection. There is also evidence that the great variations in the disease picture depend in part on the variety of parasite concerned.
In the differentiation of species emphasis has been laid on the form or color of the giant colony or on the presence or abundance of such structures as fuseaux, spiral hyphae and nodular organs. This has led to the setting up of many species. Brumpt in his last edition of the "Précis de parasitologie" listed seventy-nine. Even so, it is often difficult to identify freshly isolated strains with any one of them.
Sabouraud was able to demonstrate that certain species were parasites of one or another domestic animal, and that human infection with a particular dermatophyte often occurred from one animal. He also
EMMONS CW. PLEOMORPHISM AND VARIATION IN THE DERMATOPHYTES. Arch Derm Syphilol. 1932;25(6):987–1001. doi:10.1001/archderm.1932.01450021021001
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