2SO 



BOTANICAL GAZETTE 



[OCTOBER 



gelatin the growth was more uniform than on beef agar, and the zones 

 were somewhat clearly marked, liquefaction following in the wake 

 of the mycelium^ lagging about 4 or 5"^"^ behind the mycelial tips. 

 In litmus lactose agar the colonies developed as on beef agar with- 

 out acidity- 



Upon cow pea lea} agar the growth, while exactly parallel in rapidity 

 with the grow^th upon the cow pea agar, exhibited remarkable differ- 



ences in the structure of the colony, 

 the number of zones being much less 

 and the breadth consequently much 



greater. 



mycelium also 



clung 



■ 



Fig. 8. Abnormal hyphae, mature, as groTvn in gelatin, the cells being unusually 

 swollen.— Fig. 9. Thickening of hyphae, produced by too high temperature or an 

 excess of nitrogenous food. 



closer to the medium, was less floccose and less aerial, and in the older 

 region of the mycelium the cells became extraordinarily thick and 

 short and assumed a dark color. In some instances the protoplasm 

 within the cell rounded off and became invested by a thick brown 



coat. 



much 



ness, often four or five times as thick as the diameter of the mvce- 



lium, w^ould form 



mycelial threads (fig 



pea 



growth of this fungus. The 



