CHAPTER XVIII. 



COLEOCHyETE. 



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

 interesthig. 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) 



Fig. 112. 



Stem o f 

 aquatic plant 

 showing co- 

 leo ciiiE t e, 

 natural size. 



Fig. 113. 

 Thallus of Coleocll^^te 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 



no 



