Cladophoracece 



105 



ment usually form zoogonidia, and that the free-floating species 

 are usually propagated by resting-spores. 



Fig. 40. 



B 



Cladophora glomerata (L.) Kiitz., from Shipley, W. Yorks. 

 A, nat. size; B, x 85. 



Most of the species of the genus are marine, but some five or six British 

 freshwater species are known. Cl. glomerata (L.) Kiitz. (fig. 40) is an abundant 

 species, occurring as dark green masses attached to rocks and stones in 

 streams and waterfalls. The branching is dense and the smaller branches 

 are in tufts. Cl. crispata (Roth) Klitz. is another common species, usually 

 occurring attached to stones. Cl. flavescens Ag. is a more slender species of a 

 pale yellowish-green colour and frequently occurs floating freely in ponds and 



