KET TO THE GENERA. 127 



(i.) Main stem mostly undivided, bare at 

 base, clothed above with simple im- 

 branched ramuli. Halosaccion. 



(ii.) Robust, coarse, profusely branched, 

 branches often ending in twining 

 tendrils, duU brown or purple, very 

 common; six to ten inches high. 



Cystodonium. 

 (iii.) Smaller, finer, branches shorter, full red 

 or pink, rare. Gloiosiphonia. 



((5.) Plants without leading stem. 

 (i.) Large, smooth, robust, two or three times 

 divided; ramuli long, slender at point, 

 slightly curved ; reddish purple to pink ; 

 prominent fruit vessels in ramuli. Plant 

 six to twelve inches high. Rhabdonia. 



(ii.) Small, slender; ramuli long, curved; 

 beautiful delicate pink. Plants three 

 inches high. Lomentaria. 



(iii.) Larger, brownish, slender or robust; 

 branches long, ramuli very short, often 

 minute. Chondriopsis. 



(iv.) Slender, brown, branches long, bare and 

 hooked at the ends; ramuli short. 



Hypnea. 



