GREEN ALG^E. 61 



differs in being of a shade lighter color, and a some- 

 what slenderer filament. This is almost the only 

 Cladophora which gets sent over here from California, 

 though it is not the only one growing there. It is 

 reported common all along the coast. 



Cladophora refracta,* Roth. 



This plant grows on rocky shores in tide pools. 

 The filaments are very slender and fine, profusely 

 branched. The end branchlets are so profuse, and 

 so widely set, even recurved, or bent back, that they 

 give the plant a very decidedly feathery, or downy 

 appearance all along the edges of the frond and 

 branches. This is its most characteristic mark. It 

 is a bright green in the water, but fades a good deal 

 when dried and mounted. It grows three or four 

 inches high. It is a summer annual, and may be 

 looked for on the whole coast, in tide pools, or float- 

 ing up from deep water. 



Cladophora gracilis, f Griff. 



This species grows in deep water, parasitical upon 

 Zo:;tcra and smaller Alga^' in the Laininaria region. 

 It generally has its main branches much interwoven 



* Refracta = bent back. 



t Gracilis = slender, graceful. 



