252 SEA MOSSES. 



derer plant than the last, though growing to the 

 height of eighteen inches. The frond is compressed 

 or flat ; one-tenth of an inch wide, of uniform breadth, 

 with a leading stem, and branches and pinnae on 

 both edges ; the axils of primary and secondary 

 branches narrow, while the pinnae are set almost at- 

 right angles to the axis of the branch. They are 

 opposite and unlike. 



The larger pinna or ramulus is undivided, one- 

 eighth of an inch long, or less, deeply and sharply 

 toothed on both edges, widened in the middle, and 

 pointed at both ends. The opposite pinna is either 

 reduced to a minute spine or pinnately divided, but 

 always much less prominent than the ramulus, which 

 sets opposite to it. The color is a light or reddish 

 brown. It does not adhere to paper. 



Genus — GLOIOSIPHONIA* Carm. 



Gloiosiphonia capillaris, Carm. 



This is often spoken of as a rare plant, but 1 

 have found it so common in the rock pools about 

 Marblehead, that I can hardly think of it as rare 



* Gloiosiphonia = A viscid tube. 



