CATALOGUE OF PLANTS. 231 



being of a bright red, instead of the usual yellowish or whit- 

 ish color. The tetraspores are usually formed outside the host, 

 at the tips of short branches which come out through the 

 host walls. In tubes of Sertularia, etc. Near Seal Harbor 

 (Collins). 



RHODOMELACE^. 



POLYSIPHONIA, Grev. 



P. urceolata (Lightf.), Grev. 



Not uncommon in tide pools. Little Cranberry Isle; Seal 

 Harbor (Collins). 



P. nigrescens (Dillw.), Grev. 



One large plant floating at Bracy Cove (Collins). 



P. fastigiata (Roth), Grev. 



Common on Ascophyllum, all along the shore (Collins) ; 

 Somes Sound (Holden). 



* P. Olneyi, Harv. 



A single specimen on Zostera floating in Somes Sound, in poor 

 condition, but in fruit and unmistakable. Specimen not pre- 

 served (Holden). 



P. violacea (Koth), Grev. 

 Somes Sound (Holden). 



RHODOMELA, Ag. 

 R. subfusca (Woodw.), Ag. 

 Sea Wall (Holden). 



DELESSERIACE^E. 



DELESSERIA, Lamour. 

 D. sinuosa (Good. & Woodw.), Lamour. 



Occasional in tide pools, and from deep water (Collins) j 

 Sea Wall (Holden). 



