TRICHOPHYTONEAE 533 



Colonies of T. tonsurans type, the walls of the crater bend inward, radial 

 folds very regular, the whole suggesting a pouch closed by a draw string, color 

 cream white, less yellow than the other members of the group. Pleomorphism 

 not observed. 



Trichophyton umbilicatum Sabouraud, Maladies du cuir chevelu 3: 315, 

 1910. 



Trichophyton (Chlamydoaleurosporia) umhilicatum Guiart & Grigorakis, 

 Lyon Med. 141: 377, 1928. 



Produces tinea tonsurans, Malmstenia type. Rare in Cagliari, Venice, 

 Bessarabia, and Boston, Mass. 



Aleurospores lateral only, chlamydospores both intercalary and terminal, 

 the wall ruptures allowing the contents to escape at the beginning of germi- 

 nation. Cytology of germination wholly unknown. 



Young colony looks like a conventionalized flower. When older, deeply 

 umbilicate in center like a maturing fruit, in old age, folded and contorted 

 recalling the other species of this group. Velvet similar to that of pleomorphic 

 colonies appears in old colonies but, when transferred, it gives rise to colonies 

 similar to the original colony so that no true pleomorphism is known. 



Trichophyton rotimdum MacCarthy, Ann. Derm. Syphiligr. VI, 6: 44-49, 

 PL 5, 1925. 



Producing a pruriginous, desquamative lesion on the foot of a young 

 Brazilian recently arrived in France. 



Aleurospores 5-7/x, on simple or compound thyrses ; chlamydospores borne 

 in groups, increasing in abundance with the age of the cultures. 



Giant colony 8 em. in diameter, surface powderj^ white, central plateau 

 3 cm., elevated 1.5 cm., finally depressed in center; forms, crater; border finally 

 cream color; reverse wine red under crater, rest brown mahogany; no pleo- 

 morphism in 6 months. On Sabouraud conservation agar, crater becomes 

 irregularly furrowed. 



Trichophjrton circumvolutum Sabouraud, Maladies du cuir chevelu 3: 

 320, Fig. 128, 1910. 



Circinate lesions of the buttocks, 3-4 cm. in diameter, erythematous with 

 adherent scales on man in Dahomey. His little daughter with tinea tonsurans, 

 Malmstenia type at multiple points, cold evolution. 



Colonies heaped (suggesting Achorion), cerebriform when young, crackled 

 when old. 



Unfortunately not fully described, perhaps referable to Favotrichophyton 

 along with F. violaceum. So many species of dermatophytes from Central 

 Africa have been poorly described that only the cultivation of a large series 

 of cases in those regions will make possible future identification or indicate 

 probable synonymy. Fortunately, to aid in this work, figures of most of the 

 giant colonies exist. 



Trichophyton areolatum Negroni, Ann. Parasitol. Hum. Comp. 7: 438-443, 

 1929. 



