120 KJELLMAN, THE ALGA OF THE ARCTIC SEA. 
lantic as well as the arctic, but in the latter it has only a limited distribution. It 
goes far northwards in Baffin Bay, where it is said to be found at Lat. N. 73° 20°. 
It reaches its maximum of frequency in the Norwegian Polar Sea. The most com- 
mon form is f. typica; f. roseola is known to me only from the southern part of the 
Norwegian Polar Sea. 
Localities: The Norwegian Polar Sea: at Nordlanden common and abundant, at 
Finmarken common and abundant on open shores, at Maasé, Gjesver and Oxfjord, at 
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Geogr. Distrib. This species belongs to both regions of Polar Sea, the At- 
Talvik and in Mageré sound. 
The Murman Sea: on the coast of Russian Lapland and of Cisuralian Samoyede-land. 
The White Sea: scarce (?). 
Baffin. ay: probably pretty plentiful on the west coast of Greenland, as at 
Julianeshaab, Ameralik, Godthaab and at Lat. N. 73° 20’, Long. W. 57° 20', Egedes- 
minde (?). 
Polysiphonia Brodiwi (Ditiw.) Grev. 
in Hook. Brit. Fl. 2, p. 328; Conferva Brodizi Ditiw. Brit. Conf. t. 107. 
f. Kiitzingit nob. 
f. parvula, circa 6 cm. alta, czespitosa, densa. 
Fig. Polysiphonia Brodizi Kiitz. Tab. Phye. 14, t. 1. 
f. Agardhii nob. 
Descr. Wutchinsia Brodiwi a AG. Spee. Alg. 2, p. 63. 
Exsice. Polysiphonia penicillata Arrscu. Alg. Scand. exsicec. N:o 64. 
f. Lyngbyet nob. 
Descr. Hutehinsia Brodiawi Lyngb. Hydr. Dan. p. 109. 
Fig. » » » » » t. do. 
a. laxa nob. 
forma sequente robustior, penicillis ramulorum paucioribus, permagnis, distantibus. 
2. confluens nob. 
forma penicillis ramulorum creberrimis, apicem axis primarii versus valde approximatis, confluentibus. 
Syn. Polysiphonia Brodiwi Kien, Nordl. Alg. p. 13. 
Remark on the definition on the form. In Kuren’s collections, that are rich in 
specimens of this species from the Norwegian Polar Sea, there are to be found three 
distinctly marked forms, besides several intermediate ones. Unfortunately this algologist 
has given no information as to their occurrence and habitat. The form denominated 
by me f. Kiitzingii, much resembles in habit a low Rhodomela lycopodioides f. lava. It 
agrees in ramification with the plant figured 1. c. by Kirziva under the name of P. 
Brodiwi, with which however the diagnosis given by him in Spec. Alg. of an homony- 
mous alga accords but little. In the last-quoted passage he means apparently the same 
form that AGarpu describes in Spec. Alg. under the name of Hutchinsia penicillata, 
