THE MARINE ALG^L OF NEW ENGLAND. 53 



given off at an acute angle; cells with delicate cell- wall, .03-6 mm in 

 diameter, terminal cells acute. 



On stones and wood-work near low- water mark. Summer. 



From Halifax, X. S., to Charleston, S. C, Harvey; Newport, E. I. j 

 Europe. 



A delicate species which is characterized by its light color, loosely tufted habit, and 

 slender branches, which are all given off at uniformly acute angles. When growing 

 in exposed localities the tufts are short, but in quiet bays they become long and loose. 

 This species, which has the light color and slender filaments of C. albida, differs from 

 .That species in not being spongy in consistence and in the length of the ultimate 

 branchlets, which are always erect. Our Newport species resemble very closely the 

 No. 120 & of Wittrock and Nordstedt, Algae Scandinavica?, which is considered by them 

 a form of C. crystallina, (Roth), but differs from the CI. crystallina of the algoloLcists 

 of Southern Europe. It may be remarked that CI. glaucescens, (Griff.) Harv., has been 

 referred to other older species, but not knowing the limits of C. crystaUina, (Roth), and 

 C. sericea, (Huds.), we have adhered to the latter name, as has also been done by L& 

 Jobs and other French algologists. This species generally becomes very pale in drying 

 and adheres well to paper. 



The variety /?, pectinella, of this species, mentioned by Harvey in the Nereis Am. 

 Bor. as occurring in Charleston Harbor, is not known on our northern coast. In the 

 variety the branches are said to be recurved. 



C. l^tevirens, (Dillw.) Harv., Alg. Danmon., Xo. 142; Fkyc. Brit., 

 PI. 190. 



Filaments muck branched, rigid, forming loose tufts 3-6 inches long, 

 color a yellowish green; branches fastigiate, erect, often opposite or 

 in threes, ultimate branches secund, of few cells, apex obtuse; di- 

 ameter of cells .0o-.15 mm . 



In tide-pools. 



Xew York Bay; Boston, Harvey ; Gloucester, Mass., Mrs Davis. 



A rather robust species, recognized by the denseness of the branches, which are 

 crowded at the tips. Less robust and differing from C. Hutcliinsice in having fastigi- 

 ate branches. We have only seen one specimen, collected by Mrs. Davis, which cor^ 

 responded exactly to the C. Icetevirens of Algse Danmonienses and to the C. Icetevirens 

 of the Nereis Am. Bor. It is doubtful whether the forms to which the same name has 

 been given by French botanists belong to the same species as our own. Some of them, 

 at least, appear to belong to a more slender and less densely branching species. The 

 species does not adhere well to paper in drying. 



C. Htjtchlnsi^g, (Dillw.) Kiitz. (CI. Hutchinskc, Phyc. Brit., PL 

 124.— CI. diffusa, Harv., Phyc. Brit,, PL 130.) 



Filaments rigid, glaucous green, fiexuous, forming loose tufts 0-E2 

 inches long; branches scattered, rather distant; ultimate branches 

 few, short, secund ; cells .lO^d 111111 in diameter. 



In tide-pools. 



Gloucester, Mass., Mrs. Davis. 



A single specimen which seems unmistakably to belong to this species was collected 

 by Mrs. Davis. The species, which is one of the coarsest on the coast, is distinguished 



