52 



LIST OF THE BEITISH 



XXXII. Cladostephus. 



Frond inarticulate. Hamuli whorled. Spores borne 

 by accessory ramuli. 



1 . Cladostephus verticillatus. 



2. „ spongiosus. 



XXX1IT. Sphacelaria. 



Frond flaccid. Ramuli distichously branched, mostly 

 pinnated. Oval spores borne on the ramuli. 



1. Sphacelaria filicina. 



2. 





Sertularia. 



3. 



5> 



Scoparia. 



4. 



19 



plumosa. 



5. 



J» 



cirrhosa. 



6. 



5> 



fusca (olivacea). 



7. 



>> 



radicans. 



8. 



)> 



racemosa. 



XXXIV. Ectocarpus. 

 Frond branching. Hamuli scattered. 



1. Ectocarpus siliculosus. 



2. „ amphibius. 

 8. „ fenestrate. 



