A CHORION SCHOENLEINI 



1013 



Cultures— The fungus is easily cultivated on various media. 

 On Sabouraud's agar and on glucose agar the growth, when com- 

 pletely developed, is convoluted or cerebriform, and somewhat 

 bulging. It has been compared by Sabouraud to the appearance 

 of a sponge. The colour is white-yellowish, like that of old wax. 

 After a time cultures become pleomorphic and abundant;" white 

 duvet is present. To prevent pleomorphism, media not^^containing 

 sugars should be'used (see p. 996). 



A. schoenleini liquefies gelatine in between three to fourfdays. 

 while the Trichophytons take generally between fifteen to twenty 

 days. 



By inoculation of pure cultures of the fungus favus lesions are 

 produced in man, dogs, mice, rabbits, and fowls. The inocula- 

 tion in guinea-pigs does not give 

 rise to typical favus lesions with 

 scutula, but to circinate tri- 

 chophytic-like lesions. 



Fig. 512. — So-called Yellow 

 Bodies in Cultures of Acho- 

 Hon schoenleini Lebert. 

 (After Bodin.) 



Fig. 513. — Claviform Bodies 

 IN Cultures of Achorion 

 schoenleini Lebert. 



Reproduction. — This takes place — 



1. By sprouting. 



2. By elongated fusiform structures analogous, according to 

 some authorities, to the so-called ' spindles ' of the Trichophytons 

 and Microsporons, but they are slenderer and not septate. These 

 formations are called by the French authors 'chandeliers faviques,' 

 on account of their shape somewhat resembling a candlestick. 



3. By so-called ' favus ' or ' yellow bodies,' which are structures 

 8 to 15 in diameter, generally terminal, showing a double contour, 

 and containing a granular substance. These structures should 

 probably be considered to be chlamydospores (see also general 

 remarks on the genus Achorion). 



Sabouraud admits only one species of human Achorion, but 

 Neeb and Unna have described as many as nine: Achorion cys- 

 ticum, A. tarsiferon, A. moniliforme, A. demergens, A. akromegalicum, 

 A. dikroon, A. radians, A. euthythrix, A. atacton. Sabouraud's 

 opinion is the one generally accepted at the present time. 



