TRICHOPHYTONEAE 509 



MEGATRICHOPHYTON 



Megatrichophyton Neveu-Lemaire, Precis Parasitol. Hum. 54, 1921. 



Ectotrichophyton sect. Euectotrichophyton Castellani & Chalmers, Man. 

 Trop. Med. ed. 3, 1007, 1919. 



The type species is Megatrichophyton roseum (Bodin) Neveu-Lemaire (T. 

 rosaceimi Sabouraud). 



Only chlamydospores and simple tliyrses bearing aleurospores present, 

 arthrospores on the hair large; lesions usually confined to the beard, dry, 

 suggesting pilar ichthyosis ; on domestic animals, it produces a dry squamous 

 lesion in which the large scale peels ofi! taking the infected hair with it and 

 leaving a grayish denuded area. Rarely, on man, the lesions are accompanied 

 by inllammation. 



Key to Megatrichophyton 



Eeverse yellow, colony white; on conservation agar, center yellow orange, glabrous, folded, 



center depressed. M. canimim. 



Reverse yellow, then mahogany red, diffusing; colony white. M. equinum. 



Eeverse brick red; colony powdery white with central knob; reverse not colored on glucose. 



M. nodoformans. 

 Reverse gooseberry violet, colony pale rose; on conservation agar, reverse black, colony white; 

 pleomorphic colony with central boss and five petaliform sectors. 



M. roseum. 

 Reverse not colored, colony with slightly acuminate wine red center, flat white border. 



M. roseum, var. vinoswm. 



Meg-atrichophyton caninum (Matruchot & Dassonville) Dodge, n. comb. 



Trichophyton caninum Matruchot & Dassonville, Bull. Soc. Centrale Med. 

 Vet. 56: 50-71, 1902. 



Sahouraudites caninus Ota & Langeron, Ann. Parasitol. Hum. Comp, 1: 

 327, 1923. 



Causes folliculitis depilans in dog, apparently ectothrix. Inoculable to 

 dog and guinea pig. Not reported since the original case in France. 



On Sabouraud glucose, colony floccose, snow white, medium colored yel- 

 low ; on Sabouraud conservation agar, growth slower, yellow orange at center, 

 glabrous, folded, center depressed. On potato, growth still slower producing 

 a yellow pigment which diffuses into medium. On carrot and squash, colony 

 velvety and less colored. 



As there is still some doubt whether this species represents the imperfect 

 stage of Gymnoascus setosus, it has been treated separately here. The peri- 

 thecia attributed to this species by Sabouraud (1910, p. 643) are those which 

 Matruchot & Dassonville later described as Eidamella spinosa, a synonym of 

 G. setosus. 



Megatricliophyton equinum (Gedoelst) Neveu-Lemaire, Precis Parasitol. 

 Hum. 54, 1921. 



Trichophyton sp. Matruchot & Dassonville, C. R. Acad. Sci. Paris 127: 

 279-281, 1898; C. R. Ass. Franc. Av. Sci. Notes et Mem. 1898: 449-455, 1899. 



