5 I - 



CTXTCKE STUDIES OF FTXGI. 



14 X 15 p, although the length may vary from 12 to 15 /». In this 

 respect it differs from V. agaricinum in which the conidia are smaller 

 and ovoid in shape. Both of these forms have been cultivated in 

 pure cultures for some time and seem to be absolutely distinct, the 

 one, V. agarieinum. producing ovoid conidia often clustered at the 

 apex of the sterigmata as well as an abundance of large brownish 

 scleroria not associated with bulbils, while the other has oblong coni- 

 dia, rounded at both ends, somewhat larger than the former, and on 

 germination the mycelium invariably gives rise to bulbils, without 

 any trace of the sderoria. 



The germination of the conidia of P. Candida was carefully followed 

 in Van Tieghem cells, using different kinds of nutrient media. In 

 these cultures many interesting variations were observed, as is shown 

 in Figures 1-12 and 15-27, Plate 4, all of which have the same magnifi- 



• riation in the size of the conidia. 



During the first twenty-four hours they enlarge by the absorption of 

 water, becoming almost sp: - in which cone: -" 



are ready to germinate, the diameter at ti . - - - 2 ;ries froi: - 

 The germ tube, which may appear at one or both e 7 - 



or from one or both sides of the conidium (Figure- 6, 8), • "irnes 

 grows out to form a mycelium (Figure 10,i on which bulbils and the 

 conidia] fructifications are produ ten, in Van Tiegham 



cells at least, it rounds up and forms anot: 

 large cells may be produced in a similar way, which become almost 



ill containing protoplasm, results. 



:.a iosabd is erk. and Bi 

 Plate 5, Figubes 1S-23. 

 Berk, and Br. appeared on 



cultures- The former 



i3ed account be! e 

 Berkeley in fa duction 



- g a great deal of 



•:*::. ._• " :■--:/. \- '::. —. In, but state; : * ' - ~ ' - -- ' " • life 



c . . 1 . 



