THE MARINE ALGifc OF NEW ENGLAND. 49 



sionally found, and in that case the species inay easily be mistaken for species of 

 Cfoztomorpha. 



B. riparittm, Both, Harv. Phyc. Brit., PI. 328. (R. salinum, Kiitz.) 

 Filaments decumbent, pale green, forming entangled masses, fur- 

 nished with numerous short root-like branches, generally consisting of 

 but few cells, but sometimes elongated, filaments from .02 m,n to .025 mra 

 in diameter, cells about as long as broad, or a little longer. PL III, Fig. 2. 

 Eastport, Maine; Kalian t, Wood's Holl, Mass., W. G. F.; New Haven, 

 Conn., Prof. D. G. Eaton ; Europe. 



An alga which is probably common all along the coast on wood-work and sandy 

 rocks between tide-marks. It forms thin light-green masses on the substance on 

 which it is growing. The root-like processes usually consist of not more than three or 

 four cells, and not unfrequently they fork. Distinguished at sight from the next by 

 its yellowish color. It often covers the ground at the base of Spartina, and it is found 

 nearer high-water mark than the next species. 



B. tortuosum, Kiitz. [Conferva implexa and tortuosa, Harv., Phyc. 

 Brit., PI. 54 a and b. — Ghaitomorpha tortuosa, Ner. Am. Bor.) 



Filaments dark green, very much curled and twisted, forming pros- 

 trate masses, diameter of filaments, .035 mm to .058 mm , cells about twice 

 as long as broad, branches few, short. 



Common all along the New England coast; Europe. 



The most common species of our coast, recognized by its dark-green color, and by 

 the very much twisted filaments which form woolly strata over other algae. Its favor- 

 ite habitat is in tide-pools, where it is exposed at dead low water. 



E. Kochtanum, Ktitz. (Conferva arenosa, Crouan, Algues Marines du 

 Fihistere, No. 355. — Conferva implexa, var., Alg. Scand., No. 187. — ■ 

 Ehizoclonium KocManum, Kiitz., in Le Jolis's Liste des Algues Marines 

 de Cherbourg.) 



Filaments pale yellow, forming loose masses of indefinite extent, cells 

 .010-14 mm broad by .036-54 mm long. 



On algae below low-water mark. Summer. 



Gloucester, Mass.; Nahant, Mass., Mr. Collins; Europe. 



Much finer than any of the species previously meutioned, covering algae with a deli- 

 cate pale-yellow fleece. It is apparently less common than our other two species, and 

 we have only found it once growing over Laminarios just below low-water mark, off 

 Niles's Beach, Gloucester. The species agrees with French specimens of E. KocManum 

 in the size and general appearance of the cells, but the root-like processes character- 

 istic of the present genus are not evident in our specimens, and the species is here re- 

 tained in Ehizoclonium on the authority of Kiitzing, in Le Jolis's Liste des Algues Ma- 

 rines de Cherbourg. E. KocManum is considered by Rabenhorst to be a variety of E. 

 Jlavicans, Jiirg., in which he also includes Conferva arenicola of Berk. Our specimens 

 agree perfectly with No. 355 of Cronan's Algues Marine dn Finistere, but are rather 

 smaller than No. 187 of Areschoug's Algae Scandinavicae, which is referred with doubt 

 to Conferva arenosa. The name which we have adopted refers our specimens without 

 doubt to French forms, but the identity with the genuine C. arenom of British botau- 



S. Miss, 59— -4 



