THE MARINE ALG^l OF NEW ENGLAND. 51 



of Agardh; but when old they become spongy nearly to the tip, and constitute the C. 

 centralis of some authors. The species is, as a rule, easily distinguished by its bright- 

 green color and erect or appressed branches in the upper portion of the plant. The 

 plant preserves its beautiful green color, and adheres to paper except when very 

 old and spongy. 



C. lanosa, (Roth) Kiitz. (C. lanosa, Phyc. Brit, PI. 6.) 



Tufts more or less globose ; filaments one to three inches long-, densely 

 matted, color at first bright green, but soon becoming pale yellow; 

 branches long, numerous, irregularly placed, often secund, given off at 

 wide angles; cells .03-4 mm in breadth, as long as broad in lower part, 

 becoming in upper part several times longer than broad. 



On Chondrus crispus and other algoe. 



Gloucester, Nahant, Mass. ; common. Europe. Spring and early 

 summer. 



Var. iincialis, Thuret. {CI. uncialis, Harv., Phyc. Brit., PL 207.) 



Filaments longer and looser than in the type, and of a lighter color. 



On sandy rocks. 



Long Island Sound ; Nahant and Gloucester, Mass. ; common. Spring. 

 Europe. 



An easily recognized species, probably common along the whole coast in spring and 

 early summer. It grows attached to sea-weeds or to sand-covered rocks at low tide 

 and below, and is often washed ashore in considerable quantities. It forms globose 

 tufts, which, when growiug, are bright green, but which soon lose their color, and, 

 on drying, became pale and silky. The var. unclalis, which is more common in Long 

 Tsland Sound, is less dense and forms looser tufts than the type. It does not adhere 

 very well to paper. 



Subgenus EUCLADOPHORA. 



Plants tufted, or, at times, stratose, not united into spongy masses by 

 rhizoidal branches or recurved branches. 



C. rupesteis, (Linn.) Kiitz., Phyc. Brit,, PI. 180. 



Filaments five to ten inches long, rigid, dark green, tufted ; branches 

 crowded, usually opposite or in fours, ultimate branches given off at an 

 acute angle, short, subulate ; cells constricted at the joints, average 

 diameter of cells .08-16 mm . 



On rocks near low-water mark. 



Common along the whole coast throughout the year; Europe. 



Recognized by its dark green color and rigidity, and by the numerous appressed 

 ramuli which are given off two or three at a joint. 



C. albida, (Huds.) Kiitz., Phyc. Brit,, PI. 275. 



Filaments slender, silky, forming dense tufts from a few inches to a 

 foot long, color a pale green; branches irregular, often opposite, ulti- 



