232 KJELLMAN, THE ALG OF THE ARCTIC SBA. 
tessima that Kuren has identified with L. Agardhi (L. caperata), and it is possibly the 
same that Gunnerus has named Ulva maaima. 
Habitat. In the Polar Sea ZL. 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. succharina var. septemtrionalis reported by Rostarinsxi from the White Sea, 
all the Z. 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 the north coast of Norway. 
The northernmost point where it is certainly known to occur is Gjesveer about Lat. 
Nels | 
Localities: The Norwegian Polar Sea: Nordlanden common and abundant; Tromsé 
amt at Tromsé, René, and Carlsé, common and abundant; Finmarken at Maas6, Gjesveer, 
Mageré Sound, Oxfjord, and Talvik. 
The White Sea: Cp. Gort 1. c¢. 
Of the forms mentioned f. oblonga appears to be commonest south of Tromso; f. 
linearis was plentiful at Gjesver, f. graundifolia at Maasé and Gjesver; f. latissima was 
abundant at Talvik in Altenfjord, more rare at Maasé and in the sound south of Magerd. 
Laminaria longicruris Dr ta Pyt. 
Prod. Terre neuve p. 177. 
Descr. Laminaria longicruris J. G. Ac. Spee. Alg. 1, p. 135. 
ig. » » De ra yRylisli ves ts ee: PooretyD: 
» » Harv. Phye. Brit, t. 339. 
Eesice. » » Far. Eat. and Ands. Alg. Amer. N:o 117. 
Syn. Laminaria longicruris J. G. Ag. Gronl. Lam. och Fue. p. 15; Gronl. Alg. p. 110. 
» » Asum. Alg. Hayes, p. 96. 4). 
» » Brown, Fl. Disc. p. 457. 
» » Dickie, Alg. Cumberl. p. 237; Alg. Sutherl. 1, p. 141; Alg. Nares, p. 6. 
» saccharina Dickin, Alg. Walker, p. 86; Alg. Sutherl. 2, p. 191 (?). 
Remark on the species. JT cannot at all share the opinion of Gosr that »die Art 
Lam. longicruris ganz zu streichen ist und die unter diesem Namen verstandenen Formen 
') That ZL. phyllitis which is stated by AsuMEaD to occur in Smith Sound, is probably young individuals of 
this species. Cp. Asum. Alg. Hayes, p. 96. 
