THE MARINE ALGiE OF NEW ENGLAND. 183 



Rather 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 as Nahant. 

 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 

 Lave 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 Stilopliora, page 89 : 



AKTHEOCLADIA, Duby. 



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

 filament formed of cylindrical cells and a series of polygonal cortical 

 cells, which, become smaller towards the surface; plurilocular sporangia 

 moniliform, borne on branching monosiphonous filaments which form 

 tufts on the branches. 



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

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

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

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

 cial suborder of Phceosjporece. 



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

 losum, Berk.) 



Fronds six inches to three feet long, delicately filiform, with a per- 

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

 nate branches ; fructiferous filaments byssoid, in dense penicillate tufts 

 which form irregular whorls ; plurilocular sporangia moniliform, com- 

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

 branches of fructiferous filament; unilocular sporangia? 



Washed ashore at Falmouth Heights, Mass., Mr. F. T. Collins ; Cape 

 Fear. 



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

 1 »y Mr. Collins, which were rather smaller than European specimens. The species bears 

 a more or less considerable resemblance to J^marestia 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: 



SYMPLOOA, 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 



