180 KJELLMAN, THE ALG^ OF THE ARCTIC SEA. 



and, above all, by the uiiddle cells of" the niaiii 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 ha ve thought ht to record it at present 

 under a special naine. 



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

 fathoins 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 »inter cajspites 

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



Geoijr. Distrib. 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 Nonoegian Polar Sea: Finmarken at Gjesvajr. 



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

 to speciraens in the herbarium of the Copenhague Museum. 



Antithamnion boreale GoBi (nob.) 



Antithamuion plumula var. boreale GoBi, Algenfl. Weiss. Meer, p. 47. 



f. typica nob. 



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

 Fig. » boreale C. typica tab. uostra 16, fig. 2, 3. 



f. lapponica Rupr. (nob.) 

 Descr. Callitharanion lapponicura Rupu. Alg. Ouh. p. 343. Cfr. Gobi, Algenfl. Weiss. Meer. p. 48 — 49 sub A. 

 plumula var. boreali. 



f. corallina Rupr. (nob.) 



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



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

 Fig. Antithamuion boreale f. corallina l'ab. nostra 16, lig. 4, 5. 



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



» pluranla Kjellm. Vinteralgv. p. 64; Spetsb. Thall. 1, p. 26; Algenv. Murm. Meer. 



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

 » Kleen, Nordl. Alg. p. 21. 



Callithamnion corallina Rupr. 1. c. 

 » lapponicum Rupr. 1. c. 



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



Remark on. the deterniination 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 

 nained Antithamnion plumida in accordance with J. G. Agardh, differs in certain respects 

 from the southern species of that name. I have found låter in the eastern Murmau 

 Sea and in the Kära 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 

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

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



