216 



MEDICAL MY(/0LOGY 



liquefied, and sugars not fermented. Often a filament grows some distance 

 from its colony and by repeated branching starts a new colony. Mycelium al- 

 ways growing by septation, never by sprouting; germination either unipolar 

 or bipolar ; the cells may become very long and even slightly branched before 

 septation occurs. As the hypha matures the walls and septa become thickened, 

 and the cells finally separate, forming arthrospores. Since thickening of the 

 wall occurs before disarticulation, the spores remain strictly cylindric, the 

 ends not round, while in some species the wall undergoes a gelification, and 



Fig. 45. — Geotrichuni. 1, germination of arthrospores ; 2, fragments of filaments ; S, 

 formation of arthrospores ; i, chains of young arthrospores ; 5, young arthrospores showing 

 cylindric appearance ; 6, mature arthrospores with rounded ends ; 7j chains of arthrospores. 

 (After Langeron & Talice 1932.) 



the arthrospores tend to become ellipsoid. In the latter case, it is often diffi- 

 cult to separate species from Monilia (sensu strictiore) or Candida Berkh. excl. 

 syn. Chlamydospores have also been reported (Fig. 45). 



In Geotrichum versiforme, the only species whose cytology has been care- 

 fully investigated (Moore 1934), the young germ tube arising from the uni- 

 nucleate arthrospore is 2-3-nucleate, rarely up to 8-nucleate. As the hypha 



