THE MARINE ALG.E OF NEW ENGLAND. 183 



Kather common at Eastport, where it is often dredged. It is also found at low- water 

 mark during the spring tides, especially on Clark's Ledge. Small forms of what may 

 be the same species are occasionally washed ashore after storms as far south asNahant. 

 The species is at once distinguished, from all our other forms by the very numerous, 

 short, stout, cylindrical branches. The conceptacles are external and contain two- 

 parted spores, which may possibly be later four-parted, although in the specimens we 

 have examined they seemed to be quite mature. The conceptacles, as far as could be 

 made out, had no distinct orifice, and were very much flattened externally. 



ADDENDA. 



To follow Stilophora, page 89 : 



AKTHEOCLADIA, Duby. 



Fronds olive-brown, filiform, brancbing, composed of a large central 



filament formed of cylindrical cells and a series of polj gonal cortical 



cells, which become smaller towards tbe surface ; plurilocular sporangia 



moniliform, borne on brancbing monosipbonous filaments wbicb form 



tufts on tbe branches. 



A small genus, consisting of a single species, which has been divided by Kiitzing into 

 three, characterized by the tufts of monosipbonous filaments which bear the sporan- 

 gia, and which are arranged in whorls, giving the fronds a nodose appearance. Har- 

 vey and Agai'dh place the genus in the Sporochnacece, while Le Jolis places it in a spe- 

 cial suborder of Plueosporece. 



A. villosa, Doby. (Sporoclinus villosus, Ag., Sp. — Elaionema vil- 

 losum, Berk.) 



Fronds six incbes to tbree feet long, delicately filiform, witb a per- 

 current axis and usually opposite, widely spreadiug, 1-2 oppositely pin- 

 nate brancbes ; fructiferous filaments byssoid, in dense penicillate tufts 

 wbicb form irregular wborls ; plurilocular sporangia moniliform, com- 

 posed of numerous cells, about 15-20 in a row, generally secund on tbe 

 brancbes of fructiferous filament; unilocular sporangia? 



Wasbed asbore at Falmoutb Heigbts, Mass., Mr. F. T. Collins ; Cape 

 Fear. 



A rare species, only known on the New England coast from the specimens collected 

 by Mr. Collins, which were rather smaller than European specimens. The species bears 

 a more or less considerable resemblance to Dcsmarcstia viridis, but the penicillate tufts 

 are more regularly arranged in whorls, and bear the sporangia, which is not the case 

 in the genus Desmarestia. 



To follow Lyngbya, page 34 : 



SYMPLOCA, Kiitz. 



Filaments as in Lyngbya, but adhering to one another in fascicles. 

 Scarcely distinct from Lyngbya except in the existence of a mass of jelly, by means 

 of which the filaments adhere to one another in meshes. In habit the species of the 



