88 SEA MOSSES. 



from Santa Cruz northward. I have seen but one 

 specimen of this curious and interesting plant, and 

 that was^ kindly sent me by Dr. Anderson. It is a 

 small but apparently a typical one. The excellent 

 figure and description given by Ruprecht leaves noth- 

 ing in that line to be desired. The main stem is 

 many pronged at the base, hollow, about half an 

 inch thick, which size is uniform, except that it tapers 

 a little near the top, and about a foot long. It is 

 crowned with a cluster of stalked leaves a foot or 

 more long, an, inch or so wide at the middle, tapering 

 to a point at the top, and set in pairs upon the long 

 forked petiole. The leaves iire curiously ribbed or 

 "fluted" lengthwise, the higher ribs being in the 

 middle. An examination shows that the depressions 

 on one side correspond to the elevations on the other 

 side of the leaf. It is found at all seasons on exposed 

 points, growing upon the rocks. 



Genus.— PTER YG OPHORA* R'upr. 



Pterygophora caufornica, Rupr. 



For a fine plant of this species I am also indebted 

 it 

 to the liberality of Dr. Anderson, and for a full 



* Pterygophora = Wing-bearing. 



