CONFERVACE^. 75 



4. Cladoi'IIORA cartilag'mea* Rupt.; tufts ? filaments robust, setaceous 



elongate, firm, somewhat rigid, rather sparingly branched; branches very erect, scattered 

 long and virgate, undivided, straight, set with a few scattered, erecto-patent, filiform 

 branchlets, which are either naked or bear one or two minute ramuli ; articulations in 

 the older parts much shorter than their diameter ; in the younger (towards the ends of 

 the branches) as long, or twice as long as broad. Rup. Ahj. Ochotck, p. 211,(403.) 



Hab. Unalaschka, Z)r. Ruprecht. (v. s. in Herb. T.C.D.) 



My only specimen is a fragment, but it seems to belong to a well characterised species 

 of large size. The portion before me is about four inches long, with a few lateral 

 virgate branches, set at very acute angles, quite simple, straight and three inches long, 

 furnished with several scattered, simple, erect ramuli, each of them from half an inch to 

 an inch in length, obtuse, nearly as thick as the stem from which they spring. These 

 are mostly naked, but in a few cases they bear a minute ramulus near the tip. The 

 apices are not attenuated. The diameter of the filament is equal to that of hogs' bristle. 

 The substance is firm and cartilaginous, and the colour a pale-green. Through the 

 greater part of the filament the articulations are much shorter than their diameter ; 

 but towards the apices they are longer, and the few terminal joints are twice as long as 

 broad, or more. 



*** ARCTiE. Filaments soft, forming dense, spongy, fastigiate tufts of a pale, but 

 vivid green. 



5. Cladophora arcta, Dillw. ; tufts dense, more or less matted at the base, starry, 

 fastigiate, soft, brilliant and glossy green ; filaments capillary, much branched ; branches 

 straight, crowded, very erect ; ramuli opposite or scattered, erect or appressed ; articu- 

 lations in the lower part of the frond about twice as long as broad, in the upper (younger) 

 branches many times longer than the diameter ; apices obtuse. Dillw. Conf. Supp_ 

 p. 67, t. E. E. Bot. t. 2098. Harv. Phyc. Brit. t. 135. C. arcta, vauchericeformis, 

 and centralis, Auct. C. scopceformis, Rup. 



Hab. Coasts, from the Arctic Regions to New York Bay, on rocks near low water 

 mark. Whalefish Islands, Davis's Straits, Dr. Lyall. Prince Edward's Island, Dr. Jeans. 

 Penobscot Bay, Dr. Young. Boston Harbour, Mr. G. B. Emerson. New York Bay, 

 Messrs. Walters, ^-c, W. H. H. (v. v.) 



* Besides this species Dr. Euprecht notices the following from Russian America ; — C. adherens, Rup. from 

 the Arctic Sea, allied to C. arcta (if it be different) ; C. Chamissonis, Rup. from Unalaschka ; C. Mertensii, R. 

 from Siteha ; C viminea, Rup. from Sitcha and Unalaschka ; C. scopceformis, and C. coalita, from Northern 

 California. Of these Dr. Ruprecht has sent me fragments of C. C/iamissonis, C. viminea, and C. coalita; but as 

 he has not, that I am aware of, assigned full specific diagnoses to any of the above species, I am unwilling to 

 describe the few that I possess, from the very imperfect materials at my command, lest I might add to the 

 confusion already sufficiently confounded in this genus. I collect the above names from Dr. Riiprecht's Alff. 

 Ochotsk., as already quoted. 



