290 BRITISH SEA-WEEDS. {^Rhoclosjiiermeoi. 



2. Rytiphl.ea complanata, Agardh, 



Hab. In rock-pools, among CoralUna officinalis. Peren- 

 nial ? Summer. Yery rare. Discovered in Bantry Bay by 

 Miss Hutcliins. Obtained by Professor Harvey, Ireland; 

 by the Rev. W. S. Hore, Professor Walker Arnott, Dr. 

 Jacob, in England. See fine figure, Phyc. Brit., PI. clxx. 



3. Rytiphl^a tiiuyoides, Harvey. (Plate XV. fig. 59, 

 plant of natural size; and part of a branch, magnified.) 



Hab. Rocks in the sea, rock-pools. Perennial. Summer 

 and autumn. Bantry Bay, Miss Hutcliins; Prof. Harvey, 

 Miltown Malbay ; Mrs. Griihths and Mr. Ralfs, Devonshire ; 

 Mr. AY. Thompson, Ballantrae ; D. L., Portincross ; D. L., 

 jun., iVi-ran. 



It is a variable plant, some specimens resembling Poly si- 



plionia nifjrescens, and others approaching Polysiphonia 



fruticulosa. It often bears yellow antheridia in summer; 



colour of the plant, a brownish-red, becoming darker in 



drvinj?. 



4. Rytiphl.ea fruticulosa, Harvey. 



Hab. On rocks in the sea; sometimes in rock-pools, and 

 at other times on sand-covered rocks. Perennial. Summer 

 and autumn. Frequent on the southern shores of England. 

 Got in Ireland by Miss Hutcliins, Mr. W. Thompson, Mr. 



