Timelines: 1839
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Trichophyton schoenleinii
A fungus of the scalp
German biologist Johann Schloenlein discovers the favus fungus, which causes dermatophytosis, or “ringworm,” of the scalp. Schloenlein’s discovery marks the first time a vegetable pathogen is determined to be the cause of a human ailment. Schloenlein becomes the founder of dermatomycoses, the study of fungal infections of the skin.