Guého & M.Th. Smith (Guého et al. 1992b) Macroscopic morphology Colonies on Sabouraud dextrose agar at 25°C are cream colored, glistening, strongly elevated and become cerebriform in the center but maintain smooth margins. The agar often cracks adjacent to the colony. Colony size is 13-17 mm after 7 days incubation. Microscopic morphology On cornmeal following 72 hours incubation at 25°C, it produces true hyphae that disarticulate into rectangular arthroconidia. Appressoria are not formed [928, 1270]. Special notes This isolate is urease positive, grows on media containing cycloheximide and at 37°C, but fails to grow at 42°C. The type strain was […]

(Morenz) Weijman (1979b) Macroscopic morphology Colonies are white, dry, and slightly farinose with radial fissures that frequently crack the agar. Colony size is 42-44 mm after 7 days incubation at 25°C. Microscopic morphology After 72 hours incubation on cornmeal agar at 25° the yeast produces true hyphae which disarticulate into rectangular arthroconidia. Also present are fusiform giant cells [1270]. Special notes This isolate is urease positive and grows at 42°C and on media containing cycloheximide. Type strains were been isolated from mushrooms and a case of cow mastitis. Clinical isolates have been isolated from the sputum of cystic fibrosis patients, […]

(Oho ex Ota) do Carmo-Sousa & van Uden (1967) Macroscopic morphology Colonies on Sabouraud dextrose agar at 25°C are finely cerebriform, lack a marginal zone, and often crack the agar. Colony size is 9-12 mm after 7 days incubation. Microscopic morphology On cornmeal following 72 hours incubation at 25°C, it produces true hyphae that disarticulate into rectangular arthroconidia measuring approximately 3-5 x 4-16 µm. Appressoria and sarcinae (septations within the arthroconidia) are formed [928]. Special notes This isolate is urease positive, fails to grow on media containing cycloheximide, grows at 37°C, and has variable growth at 42°C. Type strains were […]

(de Beurmann, Gougerot & Vaucher) Ota (1926) Macroscopic morphology Colonies on Sabouraud dextrose agar at 25°C are cream, cerebriform with broad, moist, glistening, marginal zones. Colony size is 15-17 mm after 10 days incubation. Microscopic morphology On cornmeal following 72 hours incubation at 25°C, T. cutaneum produces both blastoconidia and true hyphae which disarticulate into rectangular arthroconidia measuring approximately 3-4 x 4-8 µm. Appressoria are absent [1270], [928]. Special notes This isolate is urease positive, but fails to grow on medium containing cycloheximide. Growth occurs at 30°C, but not at 35°C. The type strain was isolated from a skin lesion […]

(Rischin) Ota (1926) Macroscopic morphology Colonies on Sabouraud dextrose agar at 25°C are white, undulate, dull, and radially furrowed. Colony size is 10 mm after 10 days incubation. Microscopic morphology On cornmeal following 72 hours incubation at 25°C, it produces primarily true hyphae that disarticulate into rectangular arthroconidia measuring approximately 3-4 x 4-8 µm. Yeast cells are seen sparingly. Appressoria are absent [1270], [928]. Special notes This isolate is urease positive and grows on media containing cycloheximide. The type strain was isolated from human skin. This species is most frequent associated with superficial mycoses [925], although it has been noted […]

Akagi ex Sugita, Nishikawa & Shinoda (1994) Macroscopic morphology Colonies on Sabouraud dextrose agar at 25°C are white, dry to creamy, and slightly farinose at the center with a wide margin containing deep transverse fissures. Colony size is 16-24 mm after 7 days incubation. Microscopic morphology On cornmeal following 72 hours incubation at 25°C, it produces true hyphae that disarticulate into rectangular arthroconidia with rounded ends measuring approximately 3-4 x 4-7 µm. Appressoria are absent [1270]. Special notes This isolate is urease positive and fails to grow on media cycloheximide or at 42°C. Type strains were isolated from the fingernail […]

(described by Malmsten in 1845) Taxonomic classification Kingdom: Fungi Phylum: Ascomycota Class: Euascomycetes Order: Onygenales Family: Arthrodermataceae Genus: Trichophyton (teleomorph: Arthroderma) Description and Natural Habitats Trichophyton is a dermatophyte which inhabits the soil, humans or animals. Related to its natural habitats, the genus includes anthropophilic, zoophilic, and geophilic species. Some species are cosmopolitan. Others have a restricted geographic distribution. Trichophyton concentricum, for example, is endemic at Pacific Islands, Southeast Asia, and Central America. Trichophyton is one of the leading causes of hair, skin, and nail infections in humans. Most of the Trichophyton species have teleomorphic forms and these teleomorphs are […]