250 SEA MOSSES. 



each other quite regularly, on both sides of the 

 plant. 



This species is a much more robust plant than 

 either of the other California Ptilotcz, thicker and 

 denser, every way in appearance. That fact will com- 

 monly serve to distinguish it from them. But there 

 are other points which help the discrimination, viz. : 

 the ultimate simple pinnule of this species is sabre- 

 shaped, arched or incurved, and toothed on the outer 

 edge only ; while theirs is relatively smaller, straighter 

 slenderer, more club-shaped, and in Pt. hypnoides, 

 not toothed, while in Pt. asplenoides it is commonly 

 toothed on both sides. 



It grows in deep water. Mr. Cleveland gets it 

 from January to April, not very common at San 

 Diego. Dr. Anderson reports it not very common, 

 on the beach, at Santa Cruz, all the year round. Mrs. 

 Bingham says it is rare at Santa Barbara j she finds 

 it, in February, washed ashore from deep water. 



Ptilota hypnoides, Harv. 



I have plants of this species quite two feet long. 

 It greatly resembles Pt. dcnsa in its general habit 

 of growth. It has a prominent leading stem, flattened, 

 branching irregularly along either edge, with long, 

 widely spreading branches. These also are beset by 



