DESMIDS, DIATOMS, AND FRESH-WATER ALG^. I09 



than wide, and are usually colorless except for a 

 narrow, light green chlorophyl band surrounding the 

 center. D. glomerdta, Fig. 90. It is common. Only 

 a small part of a plant is shown in the figure. 



9. BULBOCH/ETE (Fig. gl): 



This genus can always be recog- 

 nized by the swollen or bulbous 

 bases of the long hairs that tip 

 many of the cells. It grows as a 

 guest on larger Algse, or on the 

 leaflets of Ceratophyllum or of 

 ■other aquatic plants (Fig. 91). 



The Rev. Francis WoUe has com- 

 pleted his monographs on our fresh- 

 water microscopic flora by the 

 .addition of his work on "The Fresh- 

 water Algse of the United States," 

 ■±0 which the student is referred. Fig. 91.— Buiboch^te. 



