102 SEA MOSSES. 



Genus.— EUTHORA, Ag. 



EUTHORA CRISTATA, AG. 



The crested Euthora is among our most interest- 

 ing and beautiful northern plants. Plate XIV. gives 

 a good reproduction of a typical frond of this species. 

 In general outline, when spread on paper, it is not 

 greatly unlike some forms of Delesseria alata, from 

 which it differs, however, by having no veins or 

 midrib, and by having its end ramifications notched. 

 In D. alata they terminate in rounded points. 



The flat fan-shaped frond grows from one to 

 three inches high, and divides from the base in a 

 manner between forking and alternate branching. 

 The main branches also subdivide in the same way. 

 Sometimes they widen upwards at first, and then 

 fringe out into narrow branches. Sometimes they 

 are of the ' same width throughout, one eighth of an 

 inch or more, and rapidly divide toward the ends into 

 minute branches, each of which, under the glass, will 

 seem to be notched in at the end. It is a full bright 

 red color. 



It is found in great abundance along our whole 

 coast north of Cape Cod. It has also been dredged 

 off Block Island. It grows with Ptilota plumosa. 

 and the two Dclcssericc, on stones, shells, and other 



