I 



TRICHOPHYTONEAE 513 



This genus is of interest from the extreme host specialization of most of 

 its members. Very few species are normally found on hosts from more than 

 one family of mammals and produce more or less evanescent lesions on inocu- 

 lation into other hosts. 



Key to Species 



Colony white or whitish, rarely slightly yellowish or brownish (in jP. discoides). 



Colony circular, elevated, disc with central umbo, glabrous, sometimes with a tuft of 

 large hyphae or even covered with short hyphae, brownish neutral or humid and 

 pale yellowish; on man, inoculablc to donkey. F. discoides 



Colony waxy, surface vermiculate, umbilicate, with short radial furrows around margin, 



growth very slow; on Bovidae, western Europe. F. album. 

 Colony small globular masses, smooth and vaguely convoluted, becoming a round, velvety 

 disc with a small central hill with 19 deep radial furrows and several shallow ones; 

 after pleomorphism, four concentric ridges and 12 radial ones give the appearance 

 of a spider web, closterosporcs very rare; on Bovidae, western Europe. 



F. singulare. 

 Colony hemispheric, acuminate, margin with radial folds, growth slow, velvet short; 

 chains of arthrospores suggesting closterospores and f avic candelabra present ; on 

 Bovidae, Cameroun. F. camcraunense. 



Colony conic, spirally furrowed as a snail shell, with a short white velvet; on dromedary. 



F. Langeroni. 

 Colony vdtli cerebriform or folded center, dry, white, margin broad and flat without 

 furrows, closterospores 2-7-celled; on man, Mexico. 



F. TJrenae. 

 Colony white, floccose, spreading; on man, Eritrea. 



F. abyssinicum. 

 Colony some shade of yellow, ochraceous or brown, at least when young on Sabouraud media. 

 Citron yellow, flat convolutions sunk in agar suggesting petals of flower with wide velvety 



margin; on bull, France. F. floreale. 



Inner disc elevated, creamy yellow, outer white, in subcultures central plateau green, 

 outer zone cream yellow; human kerions, Brazil (or Portugal). 



F. flavivirens. 

 Yellowish white central boss with many short radial furrows, nodular organs present; 



pseudopityriasis capitis, Macedonia. F. balcaneum. 



Yellowish or yellowish gray, mostly on Bovidae; colony vermiculate, moist, surface slightly 

 powdery, margin of short velvet ; human kerions, Algeria, inoculable into guinea pig. 



F. luxurians. 

 Colony elevated, folded, contorted, color of virgin wax; bulls, north France. 



F. ceroton. 

 Colony bright orange, tuberculiform becoming cerebriform, grayish blue ashy with a 



white floccose margin; cattle, France. F. cinereum. 



Colony large cerebriform, much folded central mass and a yellowish gray smooth 

 border under the surface of the medium; bulls, France. 



F. expansiim. 

 Colony elevated; crater with folded edges, eccentric with white border about the base; 

 not inoculable into guinea pig ; cattle, France. 



F. coronatij/m. 

 Small central dome, margins of short crowded rays; becoming violaceous brown to 

 brownish yellow on glucose; finally velvety and finely wrinkled with small irregu- 

 lar furrows; on slieep, Algeria. F. pniinosum. 



