MORPHOLOGICAL CHARACTERS 539 



tendency to occur specially at the termination of filaments. 

 Sometimes in the course of a filament an element enlarges and 

 from it new mycelia sprout, the whole resembling chlamydospore 

 formation. Sometimes, especially in the microspora and the 

 achoria, large fusiform elements divided by transverse septa 

 are observed, which suggest conidia formation. Curious spiral 

 elements whose significance is unknown are also frequently seen. 

 We cannot enter into an elaborate description of the naked- 



FIG. 168. Photograph of drawing of scraping from favus scutula, showing 

 spores and mycelium. Unstained, x 250. 



eye characters of the various ringworm and favus fungi, and for 

 these the reader must be referred to such works as those of 

 Sabouraud. The characters vary very much with the medium 

 employed, and hence in any comparative study it is of great 

 importance that the same medium should be used, and it 

 is even necessary that a large bulk of a medium should 

 be made up at once so as to be available for an extended 

 study. 



On Sabouraud's media most of the fungi at the commence- 

 ment of their growth appear as white fluffy or felted button-like 

 colonies on the surface of the medium, and as growth proceeds 



