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



The Siberian Sea: Pitlekay. 



BaJJin Bay: the west coast of Greenlaiid, locality unrecorded. 



Rhizoclonium Ripariutn (Roth) Harv. 



Phyo. Brit. t. 238. Conferva riparia Roth, Cat. Bot. 3, p. 216. 



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

 Fig. Rhizoclonium ripariura Harv. 1. c. 



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

 Spi. Conferva arenosa Croall, Fl. Disc. p. 40 (?). 

 » obtusangula Sommerf. Siippl. p. 195. 

 Rliizoclonium litoreum Zeller, Zweite d. Polarf. p. 82 (?). 

 » » DicKiE, Alg. Oumberl. p. 239. 



» » Kleen, Nordl. Alg. p. 46. 



Bemärk 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 soraewhat 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 soraewhat 

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

 sometimes together with several other algte, 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 where it has been taken, is Fairhaven on the north-west 

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



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

 abundant according to Sommerfelt; Tromsö amt, rather plentiful at Tromsö; Finmar- 

 ken, local, but plentiful at Maasö, Gjesvaär, 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, ratlier common; the west coast of Greenland at 

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

 the present species. 



Gen. Chsetomorplia Kutz. 



Phyf. (ierm. p. 203. 



Cliastomorpha Melagonium (Web. et Mohr.) Kutz. 

 1. c. p. 204. Conferva melagonium Web. et Moiir. Reise p. 194. 



