CHAPTER XVIII. 



COLEOCHSETE. 



256. Among the green algae coleochsete is one of the most 

 interesting. Several species are known in this country. One 

 of these at least should be examined if it is possible to obtain it. 

 It occurs in the water of fresh lakes and ponds, attached to 

 aquatic plants. 



257. The shield-shaped coleochsete. — This plant (C. scutata) 



t 



Fig. 112. 



Stem o f 

 aquatic plant 

 showing co- 

 leo c ha? t e, 

 natural size. 



Fig. 113. 

 Thallus of Coleochsete scutata. 



is in the form of a flattened, circular, green plate, as shown in 

 fig. 112. It is attached near the center on one side to rushes 



