176 APPENDIX. 



Achorion Schbnleinii. 



Trichophyton Tonsurans. 



Microsporon Furfur. 



These three forms are similar to each other in nearly every 

 particular and resemble in some respects the oidium lactis, in 

 other ways the mucors. The first one, Achorion Schonleinti, was 

 discovered by Schonlein in 1839, in Favus, and is now known as 

 the direct cause of this skin disease. 



FIG. 91. 



Achorion Schbnleinii (after Kaposi). 



Origin. Found in the scaly crusts of favus. 



Form. Similar to oidium lactis. 



Growth. Is very sparse. On gelatine round white masses 

 inclosed by a zone of liquefied gelatine. 



In milk it is destroyed. 



Pathogenesis. Causes favus in man. 



Trichophyton Tonsurans. Found, in 1854, by Bazin, in Tinea. 



Form. Similar to the achorion or favus fungus. 



Growth. Somewhat more rapid than the favus, and the gela- 

 tine quickly liquefied, Old cultures are of an orange-yellow 

 color. Colonies have a star-shaped form. 



Pathogenesis. Herpes tonsurans and the various tinea? are 

 produced by this fungus. 



Microsporon Furfdr. Found in tinea versicolor, almost iden- 



