KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. N:() 5. 311 



The Siberian Sea: Pitlekay. 



Baffin Bay: the west coast of Greenland, locality unrecorded. 



Rhizoclonium Ripariura (Roth) Habv. 



Phyc. Brit. t. 238. Conferva riparia Eoth, Cat. Bot. 3, p. 216. 



Descr. Conferva implexa Aresch. Phyc. Scand. p. 434. 

 Fig. Rhizoclonium riparium Harv. 1. c. 



Exsicc. Conferva implexa Aresch. Alg. Scand. exsicc. N:o 136. 

 Spi. Conferva arenosa CroalL; F1. Disc. p. 46 (?). 

 » obtusangula Sommerf. Suppl. p. 195. 

 Ehizoclonium litoreum Zeller, Zweite d. Polai'f. p. 82 (?). 

 » » Dickie, Alg. Cumberl. p. 239. 



» 1) Kleen, Nordl. Alg. p. 46. 



Remark on this species. The plant here called Rh. riparium seems to agree most 

 nearly with that which Areschoug 1. c. has described under the name of Conferva im- 

 plexa. The boreal and arctic form is somewhat coarser and has somewhat thicker cell- 

 walls than that distributed by Areschoug in Alg. Scand. exsicc; it is somewhat less 

 curved and in general has fewer rhizoid branches than is shown by the quoted figure 

 in Harv. Phyc. Brit. However these characteristics vary much even in the same spe- 

 cimens. 



Habitat. It grows in the uppermost part of the litoral region, or even somewhat 

 above its upper margin, forming strata over rocks above tide-mark, sometimes alone, 

 sometimes together with several other algas, usually Rhodochorton Rothii. It is grega- 

 rious and flourishes in sheltered as well as exposed localities. I have found speci- 

 mens with zoospores on the coast of Finmarken during the latter part of August. 



Geogr. Distrib. It is known from the Polar Sea north of the Atlantic, and 

 reaches its maximum of frequency on the coast of Norway. 



The northernmost point whei-e it has been taken, is Fairhaven on the north-west 

 coast of Spitzbergen Lat. N. 79° 49'. 



Localities: The Norwegian Polar Sea: Nordlanden, at several places at Saltenfjord 

 abundant according to Sommereelt; TromsO arat, rather plentiful at Tromso; Finmar- 

 ken, local, but plentiful at MaasO, Gjesvasr, and Oxfjord. 



The Greenland Sea: the west and north coasts of Spitzbergen, local, but pretty 

 abundant; the east coast of Greenland (?). 



The Murman Sea: the west coast of Novaya Zemlya, local, but pretty abundant. 



Baffin Bay: Cumberland Sound, rather common; the west coast of Greenland at 

 Frideriksdal and Tessarmiut. Also at Jakobshavn, in case Conferva arenosa Croall is 

 the present species. 



Gen. Ohsetomorplia Kutz. 



Phyc. Germ. p. 203. 



Chsetoraorpha Melagonium (Web. et Mohr.) Kutz. 

 1. c. p. 204. Conferva melagonium Web. et Mohr. Keise p. 194. 



