RED ALGyE. 257 



somewhat detailed description will not be quite su- 

 perfluous. 



The frond is of cobweb fineness ; about three or 

 four inches high, densely tufted, much and finely 

 branched ; the primary branches long ; the secondary 

 alternate and decompound, all rather widely spread- 

 ing ; somewhat far asunder at the base ; more closely 

 crowded toward the top. A marked characteristic 

 of this and the next species is the presence, along 

 all the branches, primary and secondary, springing 

 from the top of each joint, of a pair of much- 

 divided ramuli, one-tenth of an inch long or more, 

 standing out widely from the branches. 



They are easily seen with the naked eye, and 

 under a glass appear to be divided into long and 

 extremely fine branches. The joints of these fine 

 divisions of the ramuli are eight or ten times longer 

 than broad. This will serve lo distinguish them from 

 the ramuli of the next species, the joints of which 

 are short and stout. It grows in deep water ^ on 

 jhells, stones and rocks. Mr. Collins has collected it 

 as late as June, at Revere, and Mrs. Davis reports 

 it very plentiful, in the spring, at Gloucester. 



Callithamnion Pylais^i, Mont. 



In many respects, this is closely related to the 

 »7 



