232 SEA JIfOSSES. 



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 edge's, 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. 



