XVIl] 



YEAST FUNGI 



475 



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 oidiuin, and 

 as o'idium albicans is recognised as the cause of " thrush " ; 

 the well-known white patches which occur on the mucous 





K.^ 



%fr 



«* 





'if*" 



t L 



V^j^ «j 



Fig. i83. — FiL^i Si'kcime.n' of Thru.^h Fungus. 



(Bousfidd.) 



X 700. 



membrane of the mouth and pharynx in suckling infants 

 and debilitated patients. 



Grawitz ' has proved by observations on artificial cultures 



that this fungus is identical with the oidium variety of Sac- 



cJiaromvces mycodcriiia ; the cells are spherical or cylindrical, 



the former about o'ooj to 0-005 mm. in diameter, the latter 



^ Virclioiu s Archill, vul. Ixx. 



