528 MEDICAL MYCOLOGY 



Colony coffee brown or roebuck brown, central crater disappearing in a month, 



leaving a deeply reticulate wrinkled colony. 



T. fuscum. 



Colony yellow or cream color, rarely pure white. 



Colony sulphur yellow, base of crater irregular, interior somewhat folded, 



red orange. T. sulphur eum. 



Colony white velvety, central portion becoming yellowish, small button in 



the middle of the crater; on Sabouraud conservation agar, colony 



contorted, less crateriform, wholly white, sometimes cracking about 



the edge of the crater, surrounded by immersed rays. 



T. tonsurans. 



Colony smaller, soon cracking deeply on the edge of the crater, marginal 



zone folded deeply with immersed fringe. 



var. ejfractum. 



Colony white, crater irregular, crackled, many radial furrows, growth 



slow. var. exsiccatum. 



Colony white, velvety at first becoming powdery, margin polygonal, often 



quadrilateral, surface of thick round folds. 



T. polygonum,. 



Colony cream white, walls of crater bending inward, folded, suggesting the 



mouth of a pouch closed by a draw string. 



T. reffulare. 



Colony resembling a conventionalized flower when young, deeply umbilicate 



in age (suggesting the blow end of an apple). 



T. umbiUcatum. 



Colony powdery, white, central button raised 1.5 cm. above rest of colony, 



finally crateriform, margin cream color; reverse wine red under 



crater, rest mahogany brown. T. rdtwndnmi. 



Colonies heaped up, not depressed or crateriform, lesions of the endothrix type {Saiowraudia 



subtype), usually tinea capitis and prepubertal. 



Colony cerebriform, usually more elevated and contorted than in the T. flavum group 



(perhaps this whole group belongs in FavotricJwphyton sect. Bodinia). 



Colony suggesting Achorion when young. 



Cerebriform and crackled in age, color unknown; lesions on buttocks, and tinea 



tonsurans {Malmstenia type). T. circwnvoVatvmi. 



Cerebriform to vermiculate, less elevated and more spreading, violet in primary 



cultures, color fading in subcultures. FavotricJwpJiyton violacewm. 



Colony cerebriform in center, margin broad, flat, dry, white, no furrows. 



„ , . . ,. v i Favotrichophyton Urenae. 



Colony acuminate, sometimes umbonate. ^ 



Colony zonate. 



Inner zone dirty purplish red, then a deep periclinal furrow, then an elevated 



red fold, moist dirty white with outer fringe of radial hyphae; radial 



furrows, crackled in the center. T. areolatum. 



Umbonate, dark ashy, surrounded by a darker furrow, then a zone of duU ashy 



and a white margin; reverse black. T. dneraceum. 



Colony not zonate. 



Colony white, circular; subcultures yellower and more filamentous. 



T. acutuVwm. 



Colony with long coremia at the center, powdery, cream color becoming brownish, 



sometimes with a violet tint, becoming a flattened cone with radial 



furrows and a tliin flat margin. 



Colony powdery. T. Sahoura/wdi. 



Colony pilose. var. piloswm. 



