266 An Introduction to Medical Mycology 



These spores arc the first formed and arc to be found in specimens from 

 the peripheral portions of a growth. 



3. FEATURES OF DIFFERENT GENERA 



The following summary is incomplete, and the various forms listed may 

 not be seen in each species. The outline may be useful for a rapid check. 



(a) MlCROSPORUM 



1. Pectinate bodies (not seen in Epidermophyton, Achorion or Tricho- 

 phyton, except T. gypseum). 



2. Nodular organ, seen in M. IiiIyiuii (also in T. gypseum). 



3. Racquet mycelium (mycelium en raquette). 



4. Fuseaux are tapering instead of blunt-ended (E. inguinale) or ter- 

 minal (T. gypseum). They are few in the human microspora (M. audouini) 

 and more plentiful in M. lanosum. 



5. Chlamydospores. 



6. Microconidia, usually occurring as hyphac sporiferae. 



(b) Trichophyton 



1. Spirals, seen in the T. gypseum group. 



2. Nodular organ, in T. gypseum. 



3. Chlamydospores. 



4. Microconidia (on thyi'si sporileri and in grqppes). 



5. Arthrospores (in direct mounts and in old cultures). 

 (e) Epidermophyton 



1. No spiral hyphac. 



2. No pectinate bodies. 



3. Racquet mycelium may be noted. 



4. Macroconidia (fuseaux), blunt-end. They arc divided by septums 

 into lour to six cells. 



5. Many chlamydospores in the vegetative part ot the colony. 



6. No spore-bearing hyphac. 



7. Arthrospores in profusion, 

 (d ) ACHORION 



1. Favic chandeliers (typical). 



2. Chlamydospores (numerous). 



3. Pectinate bodies. 



4. No fuseaux. 



5. No nodular organs, racquet mycelium or spirals. 



6. Arthrospores. 



