| Trichophyton rubrum | A widely distributed anthropophilic species that causes persistent infections of the skin, especially tinea pedis and tinea cruris, and in the nails that are unusually resistant to therapy; it rarely invades the hair, where it is ectothrix in nature; occasional subcutaneous and systemic infections have been reported. (05 Mar 2000) |
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| Trichophyton schoenleinii | An anthropophilic endothrix species of dermatophyte causing favus in man; it is endemic throughout Eurasia and Africa and, because of travel, is seen more frequently in the Western Hemisphere; it produces tunnels within the hair shaft which are filled with air bubbles after the hyphae disintegrate. (05 Mar 2000) |
| Trichophyton simii | A zoophilic species that causes infection in rhesus monkeys, dogs, and man; most infections have had their origin in India. (05 Mar 2000) |
| Trichophyton tonsurans | An anthropophilic endothrix species that causes epidemic dermatophytosis in Europe, South America, and the U.S.; it infects some animals and requires thiamin for growth. It is the most common cause of tinea capitis in the U.S., forming black dots where hair breaks off at the skin surface. (05 Mar 2000) |
| Trichophyton verrucosum | A zoophilic species that causes ringworm in cattle, from which man can become infected. (05 Mar 2000) |
| Trichophyton violaceum | An anthropophilic species that causes black-dot ringworm or favus infection of the scalp; hair infection is of the endothrix type; usually found in South America, Europe, Asia, and Africa. (05 Mar 2000) |