102 SEA MOSSES. 



and by being covered all over on both sides with 

 minute, oblong dots of a darker shade, which are 

 masses of spores. This roughening of the surface by 

 these spore masses, gives the plant both its generic 

 and specific name. It is a summer annual and 

 grows on the rocks, in pools between tides. Mr. 

 Collins has collected it at Revere and Nantasket, 

 from June to August ; Mrs. Davis, at Gloucester in 

 the spring. I have found it in the summer at 

 Marblehead, but not very common. 



ASPEROCOCCUS SINUOSUS, BORY. 



This plant much resembles our Leathesia tuber- 

 formis in outline and habit of growth, though it is 

 much thinner in substance, and grows in much 

 larger clusters. Harvey says each individual frond is 

 globose, one or two inches in diameter or larger, 

 becoming much inflated and irregular in outline as 

 it advances in age, and is thus often ruptured and 

 pierced here and there with holes of irregular shape 

 and size. The frond is membranous, thin, soft, but 

 not very tender; color, a brownish olive. It may 

 be found common all along the California coast, at 

 all seasons, growing, Dr. Anderson says, on tips of 

 Halidrys. Mrs. Bingham finds it growing on small 

 rocks and other Algae at mid-tide. Dr. Dinnick on 



