roi2 



ASCOMYCETES AND BASIDIOMYCETES 



been compared by some authorities to the ' spindles ' of the Tri- 

 chophytons and Microsporons, but they are slenderer, and not 

 septate. The French authors call these formations * chandeliers 

 faviques,' on account of their shape somewhat resembling a candle- 

 stick. 



2. Favus Yellow Baddies. — The protoplasm of some filaments 

 collects itself at the terminal ends, the filaments becoming much 

 thinner, and terminating in roundish or oval bodies, which must be 

 considered to be terminal chlamydospores. It is to be noted that 

 in the typical Achorions of human origin conidia-b earing hyphse are 

 not seen, while these are present in the Achorions of animal origin, 

 in which separate spindles may be present. 



Media. — Achorions grow well on all the usual, sugar media, 

 especially Sabouraud's agar and glucose agar. They generally 

 liquefy gelatine fairly rapidly. 



Pleomorphism. — Very common in all Achorions. If a culture 

 becomes pleomorphic, it is impossible to make it revert to the 

 original type. 



Transmission. — In the case of Achorions of human origin infection 

 takes place from man to man; in the case of Achorions of animal 

 origin infection takes place from the lower animals. It is not 

 impossible th3it]A chorions may^live saprophytically in nature. 



Table of Achorions. 



Genus, Species* 



f ^(typSalf ^'"^ } ^choenleini Lebert, 1845. 

 Achorion Remak, 1845 -\ r\c • i •„ f A. quinckeanum Zopf, i8qo. 



I (non-t>pical) y ^ arloingi Blanchard, 1891. 

 These may be recognized as follows : — 



A. Whitish-yellow cerebriform colonies — Schoenleini. 



B. White downy colonies — Quinckeanum. 



C. Yellowish colonies — Gypseum. 



A . arloingi has not been properly described. 



Achorion schoenleini Lebert, 1845. 

 Synonyms. — -Oidium schoenleini Lebert, 1845; 0. porriginis Mon- 

 tague; Oospora porriginis Saccardo, 1886; Oidium schoenleini Zopf, 

 1890. 



Causes the well-known affection called favus, which is char- 

 acterized by the presence of peculiar disc-shaped crust formations, 

 called scufula, of a sulphur-yellow colour, and emitting an offensive 

 odour which has been compared to the smell of mice's urine. 



The fungus may infect the hairs or glabrous parts of the body; 

 it may attack the nails. In the hairs the mycelium is very abun- 

 dant, the segments being comparatively long. Sometimes the 

 mycelial threads divide into three or four branches, each of which 

 terminates in a single row of roundish spores. This is known as 

 favic tarsus. 



