Cryptogamic Botany and Plant Pathology. 



411 



produce considerable growltih of myoelium before tJie thread 

 reaohjes nutritive tissues. 



In germination one or more germ tubes ai'ise from the spore 

 usually at one side of tihe ends. Figures! 3, b and c represents dif- 

 ferent stages in geniiination. The ooaiise granule® are quite 

 numerous, and in some of them have moved out into the foniiing 

 mycelium. Figure 3, e represents a farther developm(mt of myce- 

 lium and also a farther distribution of the gTanules in the threads. 



Figure 1, a, b, and c are three camera lucida sketches if the 

 growth from a spore which wais sown December fourteenth at 



12.35 p. m. a represents the growth which had taken place in 

 exactly twenty-four hours, being sketched at 12.35 p. m., December 

 fifteenth, b was sketched from the same object at 3.15 p. m. on the 

 same day, and c at 11.45 a. m., December sixteenth. The spores 

 are therefore developed with great rapidity under favorable circum- 

 stances. In tiie same culture were other spoi'es whieli developed 

 a much greater extent of mycelium and number of spwes. This 

 gTOup was chosen because of its limited extent, being thus more 

 convenient to sketch. 



During the gi'owth and production of spores the coarse granulas 

 gradually disappear. As the cultm'e ages the masis of spores 



