232 KJELLMAN, THE ALG^ OF THE ARCTIC SEA. 



tissima that Kleen has identified with L. Agardhii (L. caperata), and it is possibly the 

 same that Gunnertjs has named Ulva maxima. 



Habitat. In the Polar Sea L. saccharina is sometimes litoral, sometimes sublitoral. 

 The f. linearis lives at low- water mark together with L. digitata. The f. oblonga occurs both 

 farther down and higher up than f. linearis. The two other forms I have met with 

 only in the lower part of the sublitoral zone, in 15 — 20 fathoms. The present species 

 prefers rocky bottom, but is found richly developed also on pebbly ground. It occurs 

 in the open sea and at exposed points of the coasts as well as in the interior of deep 

 bays and in other sheltered localities. It is gregarious. On the coast of the Polar Sea 

 I have only had the opportunity of examining it during July and August, and at the 

 beginning of September. During this time f. linearis and f. oblonga were sterile, the 

 two other forms were furnished with zoosporangia. 



Geogr. Distrib. I have myself found the present species in the Polar Sea only 

 on the coast of Norway, and on that account am of opinion that, with the exception 

 of the L. saccharina var. septemtrionalis reported by Rostafinski from the White Sea, 

 all the L. saccharina which has been stated to occur in the Arctic Sea is to be referred 

 to other species. It has its maximum of frequency on tlie north coast of Norway. 

 The northernmost point where it is certainly known to occur is Gjesvasr about Lat. 

 N. 71°. 



Localities: The Norwegian Polar Sea: Nordlanden common and abundant; TromsS 

 amt at TromsO, RenO, and Carlso, common and abundant; Finmarken at Maas5, Gjesvser, 

 MagerO Sound, Oxfjord, and Talvik. 



The White Sea: Cp. Gobi 1. c. 



Of the forms mentioned f. oblonga appears to be commonest south of TromsS; f. 

 linearis was plentiful at Gjesvser, f. grandifolia at MaasO and Gjesvair; f. latissima was 

 abundant at Talvik in Altenfjord, more rare at MaasO and in the sound south of MagerO. 



Laminaria longicruris De la Pyl. 



Prod. Terre neuve p. 177. 

 Descr. Laminaria longicruris J. G. Ag. Spec. Alg. 1, p. 135. 

 Fig. » » De la Pyl. 1. c. t. 9, fig. A et B. 



» « Harv. Phyc. Brit, t. 339. 



Exsicc. » ') Farl. Eat. and Ands. Alg. Amer. N:o 1 17. 



Syn. Laminaria longicruris J. G. Ag. Gronl. Lam. och Fuc. p. 15; Gronl. Alg. p. 110. 

 » » AsHM. Alg. Hayes, p. 96. ^). 



» » Brown, F1. Disc. p. 457. 



» » DrcKiE, Alg. Cumberl. p. 237; Alg. Sutherl. 1, p. 141; Alg.- Nares, p. 6. 



» saccharina Dickie, Alg. Walker, p. 86; Alg. Sutherl. 2, p. 191 (?). 



Remark on the species. I cannot at all share the opinion of Gobi that »die Art 

 Lam. longicruris ganz zu streichen ist und die unter diescm Namen verstandenen Formen 



*) That L. phyllitis which is stated by Ashmead to occur in Smith Sound, is probably young individuals of 

 this species. Cp. Ashm. Alg. Hayes, p. 96. 



