Tin: MARINE ALG.E OF XKW KXiJLAND. 51 



of Aganlli: Imt wIumi old tlu\v hooomo spoii^^y lu'iirly to tlio tip, and constitute tlio C. 

 centralis of some authors. The species is, as a ruU', easily distinj^nished hy its l>ri;jht- 

 groou cohtr and ereet or a]>presse«l hranehes in the upper i>ortion of the ])lant. Tho 

 l>laut preserves its beautiful green color, and adheres to paper except when very 

 old and spongy. 



C. LANOSA, (lloth) Kiitz. {€. Umosa, IMiyc. Drit., PI. (>.) 



Tiit'ts iiioro or less globose ; lilanicntsoiie to three inches long, densely 

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

 branches long, nnmerons, irregnlarly placed, often secnnd, given oft' at 

 wide angles; cells .0;5~4™'" in breadth, as long as broad in lower part, 

 becoming in npper part several times longer than broad. 



On Chondrus crisjyus and other alga\ 



Gloucester, Xahant, Mass.; common. 1-^urope. Spring and early 

 summer. 



Var. UNciALis, Thuret. (C7. uncialis, Ilarv., Piiyc. lirit., IM. 207.) 



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



On sandy rocks. 



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

 Eiuope. 



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

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

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

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

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

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

 viry well to i>ai>er. 



Subgenus EUCLADOFHORA. 



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

 rhizoidal branches or recurved branches. 



C. RUPESTBis, (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 oft" at an 

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

 diameter of cells .08-10"'°\ 



On rocks near low water mark. 



Common along the whole coast througliout the year; Europe. 



Recognize<l by its daik green color and rigidity, and by th«' numerous appressed 

 anuli which are given oft" two or three at a joint. 



C. ALBIDA, (Iluds.) Kiitz., Phyc. Brit., PI. I'T"). 



Filaments slender, silky, forming den.se tufts from a few inches to a 

 i«»ot long, color a pale green; branches irregular, often opposite, ulti- 



