86 SEA MOSSES. 



not more than three-quarters of an inch through, 

 and then as suddenly expands into a large, egg- 

 shaped vesicle, the narrow end of the egg being 

 next to the neck, and the wide end crowned with 

 two tufts of long, narrow leaves. The dimensions 

 of the oviform part of the air vessel are, in the 

 long diameter two and three-quarters inches, and in 

 the short two and a quarter inches. The leaves are 

 from one -half a yard to a yard long and from half 

 an inch to one inch wide, many of them with thick 

 brown patches of spores upon them. 



Mr. Cleveland has had the kindness to send me 

 parts of a plant and drawings of the whole, which 

 enables me to add a point to the history of this 

 curious genus, that I think will be interesting to 

 collectors. This form differs from the one already 

 described, by the air vessel bearing upon its apex 

 a single large forking petiole, whose two arms spread 

 out on each side and branch, like the antlers of a 

 deer; each short "prong" bearing, at the end, a 

 broad, long leaf. In a plant whose air vessel measures 

 5 \ inches in diameter, the flattened petiole at base 

 was two inches broad, and the two " horns " into which 

 it immediately divided, were i \ inches broad and eight 

 feet long. These gave out branches upon the inside at 

 intervals of about a foot, which branches, at a distance 



