180 KJELLMAN, THE ALG^ OF THE ARCTIC SEA. 



and, above all, by the middle cells of the main axis and the long branches being only 

 half as long as in the latter. It can hardly be a distinct species. The length of the 

 cells is subject to variation. Nevertheless I have thought fit to record it at present 

 under a special name. 



Habitat. Those few individuals, which I have myself collected, grew in 10—15 

 fathoms water, attached to Lithothamnion soriferum. On the coast of Greenland it 

 appears to be litoral, as J. Vahl has noted on the label belonging to it winter ctespites 

 Gigartinse subfusca,'». From the Polar Sea it is known only as sterile. 



Geogr. Distrih. Found in the Norwegian Polar Sea and Baffin Bay. Its northern- 

 most locality is Gjesvasr on the north coast of Norway, Lat. N. about 71°. 



Localities: The Norwegian Polar Sea: Finmarken at Gjesvajr. 



Baffin Bay: the west coast of Greenland at Julianeshaab and Godhavn, according 

 to specimens in the herbarium of th§ Copenhague Museum. 



Antithamnion boreale Gobi (nob.) 



Antithamnioii pluraula var. boreale Gobi, Algeiifl. Weiss. Meer, p. 47. 



f. typica nob, 

 Descr. Antithamnion plumula var. boreale Gobi, 1. c. p. 47 et sequent. 

 Fig. » boreale f. typica tab. nostra 16, fig. 2, 3. 



f. lapponica Rupr. (nob.) 

 Descr. Callitliamnion lapponicum RuPK. Alg. Och. p. 343. Cfr. Gobi, Algenfl. Weiss. Meer. p. 48—49 sub A. 

 plumula var. boreali. 



f. corallina Rupr. (nob.) 

 Descr. Callithamnion corallina Euptt. Alg. Och. p. 340 — 341. 



Antithamnion corallina Kjjellm. Algenv. Murm. Meer. p. 24. 

 Fig. Antithamnion boreale f. corallina Tab. nostra 16, lig. 4, 5. 



iSyn. Antithamnion corallina Kjellm. Algenv. Murm. Meer. p. 24. 



» plumula Kjellm. Vinteralgv. p. 64j Spetsb. Thall. 1, p. 26; Algenv. Muira. Meer. 



p. 24; Kariska hafvets Algv. p. 23. 

 » Kleen, Nordl. Alg. p. 21. 

 Callithamnion corallina Rupr. 1. c. 

 » lapponicum Rupii. 1. c. 



» plumula J. G. Ag. Spetsb. Alg. Progr. p. 2; Bidr. p. 11. 



Remark on the determination of the species and its forms. I have mentioned already 

 in my account of the Florideas of Spitzbergen, that the plant collected here which 1 

 named Antithamnion plumula in accordance with J. G. Agaedh, differs in certain respects 

 from the southern species of that name. I have found later in the eastern Murman 

 Sea and in the Kara Sea a form resembling that from Spitzbergen, and, besides, in 

 the first-mentioned sea another form that I have considered and still consider identical 

 with Ruprecht's Callithamnion corallina. Gobi has subsequently, in his account of the 

 marine Flora of the White Sea, made a detailed and most excellent exposition of the 

 arctic algae that are most nearly related to Antithamnion plumula. He proves the form 



