xiv.] YEAST FUNGI. 139 



till a linear series of cylindrical cells was formed, separated 

 from one another only by a thin septum ; a mass of filaments 

 very much resembling a mycelium was thus formed. The 

 cylindrical cells give origin by gemmation to spherical and 

 elliptical torula-cells. 



Such a growth, in which the torula-cells are capable of 

 forming a sort of mycelium, was formerly called oidium, and 

 as oidium albicans is recognised as the cause of " thrush ; " 

 the well-known white patches which form on the mucous 

 membrane of the mouth and pharynx in suckling infants and 

 debilitated patients. 



Grawitz 1 has proved by observations on artificial cultures 

 that this fungus is identical with the oidium variety of /S'ac- 

 charomyces mycoderma; the cells are spherical or cylindrical, the 

 former about 0*003 to 0'005 mm. in diameter, the latter up to 

 0'03 or 0-05 mm. long. As above described it forms mycelium- 

 like filaments from which, by lateral and terminal gemmation, 

 spring spherical or oval torula-cells. It also forms ascospores 

 containing four to eight spores. 



1 Virchow's Archiv, vol. Ixx 



