92 SEA MOSSES. 



Ann, growing sometimes in tide pools. It need not 

 be looked for south of Cape Cod. 



Genus.— DICTYONEURON* Rupr. 



DlCTYONEURON CALIFORNICUM, RUPR. 



This is certainly one of the most interesting 

 plants of this group. It was first brought from 

 the coast of California, in 1840, by Wosnessenski, 

 a Russian navigator, and described by Ruprecht. 

 In addition to his excellent figure and full text, 

 I have several specimens kindly sent me by Dr. An- 

 derson, as a guide in giving an account of the 

 plant. The one before me is about thirty inches long 

 and two and three-fourths inches wide in the widest 

 place, tapering somewhat toward the broken top, and 

 rapidly to the stem below. The frond has a tendency 

 to bend in the direction of one edge like a sabre 

 blade. Its distinguishing mark consists, however, in 

 the fact that both surfaces of the frond are woven 

 over with a net- work of prominent veins and ribs, 

 some of which run in a general direction, parallel 

 with the edges of the frond, and others not so thick 



* Dictyoneuron = Netted nerves. 



