268 SEA MOSSES. 



In the water, it is often a deep, rich red, but 

 when on paper the red has a marked brown shade. 

 It is common along the whole coast from New York 

 northward, from June to November. I have collected 

 it in abundance on Zostera, in Marblehead Harbor, 

 in August, and on the piers at Wood's HoU, the very 

 last days of October. Mr. Collins has found it in 

 November, at Nahant. 



CaLUTHAMNION DASYOroES, Ag. 



This and the following species are all that I shall 

 undertake to describe of the Callithannia of California. 

 This plant is more robust than any of the genus grow- 

 ing in the Atlantic waters. It attains a height of four 

 inches or more. Its main stem is twice as thick as 

 a bristle, regularly and alternately branched along 

 its opposite sides. 



These branches are of irregular length. Some 

 of them as long as the main stem. Some half, and 

 some a quarter as long. The primary branches also 

 branch along the two sides in the same plane and in 

 the same manner as the main stem. Likewise the 

 secondary and tertiary branchlets sometimes, so that 

 the plant becomes pinnately decompounded three or 

 four times, the ultimate ramuli being very fine, and 

 sometimes long. 



