KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. N:0 5. Hh A 
The Siberian Sea: Pitlekay. 
Bajjiin Bay: the west coast of Greenland, locality unrecorded. 
Rhizoclonium Riparium (Ror) Harv. 
Phye. Brit. t. 238. Conferva riparia Roru, Cat. Bot. 3, p. 216, 
Descr. Conferva implexa Arescn. Phye. Seand. p. 434. 
Fig. Rhizoclonium riparium Harv. I. ce. 
Exsicc. Conferva implexa Arescn. Alg. Scand. exsice. N:o 136. 
Syn. Conferva arenosa Croat, Fl. Dise. p. 46 (?). 
» obtusangula SoMMERF. Suppl. p. 195. 
Rhizoclonium litoreum ZeLiter, Zweite d. Polarf. p. 82 (%). 
» » Dickie, Alg. Cumberl. p. 239. 
» » KEEN, Nordl. Alg. p. 46. 
Remark on this species. The plant here called Rh. riparium seems to agree most 
nearly with that which Arrscnoue 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 Aruescnove 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. Phye. 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 alge, 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 Norwegian Polar Sea: Nordlanden, at several places at Saltenfjord 
abundant according to SOMMERFELT; Tromsé amt, rather plentiful at Troms; Finmar- 
ken, local, but plentiful at Maasé, Gjesver, 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 Jakobshayn, in case Conferva arenosa CROoALL is 
the present species. 
Gen. Chetomorpha Kivrz. 
Phye. Germ. p. 208. 
Chetomorpha Melagonium (Wes. et Mour.) Ktvrz. 
lc. p. 204. Conferva melagonium Wes. et Monr. Reise p. 194. 
