104 MICROSCOPY FOR BEGINNERS. 



f. Forming small green, visible, jelly -like masses. 

 Chcetophora, 7. 



f. Not forming jelly-like masses (g). 



g. Cells of the branches green, those of the stem 



larger, with a transverse green band. Drapar- 

 ndldia, 8. 



g. Cells of branches and stem green ; bristles with a 

 swollen base. Bulbochcete, 9. 



1. BATRACHOSPERMUM (Fig. 82). 



The plant often grows abundantly, attached to sub- 

 merged objects, in springs, ditches, and ponds. It varies 

 in length from an inch or less to one or two feet, and in 

 color it may be bluish-green, brownish, or purplish. It is 

 covered with a mucous substance that makes it very slip- 

 pery and difficult to handle. It is much branched, and 

 the branches bear many short threads in 

 whorls, each thread plentifully beaded. 

 The whorls are often so close together 

 that the entire plant as it floats beneatli 

 the water seems to be a string of little 

 balls. Under the microscope each mo- 

 niliform thread is often seen to be ter- 

 minated by a colorless hair-like bristle. 



Fig. 82. Batracho- 



epfanuin moniii- This, however, is not always present. 



forme. 'With a high power the ends of the 



beaded filaments seem to run down the main stem in 

 long, narrow, almost colorless cells. J3. moni 

 Fig. 82. 



