172 KJELLMAN, THE ALGH OF THE ARCTIC SBA. 
f. coronata KLEEN. 
Nordl. Alg. p. 19. 
Deser. Ceramium acanthonotum var. coronata KLEEN |. e. 
732 ? ay 
Fig. » » » » » ifs JMO} ihe, 5 
Remark on the form coronata. In Kureyn’s collections only the typical form of 
Ceramium acanthonotum is to be found, but some specimens have the spines in certain 
parts of the frond so arranged as in the variety distinguished by Kuxun. This variety 
resembling the typical form in all other respects: branching, colour, structure of the 
cortical layer, shape and disposition of the tetrasporangia etc., it may be considered 
as rather little independent, though it deserves perhaps to be specially mentioned. 
Habitat. ‘This alga is litoral, pelagic, and somewhat gregarious in the Polar Sea. 
It keeps chiefly to such places as are left dry at low-tide, but is also to be found in 
rock-pools between tide-marks. In the localities where it has been observed as yet, it 
bears plenty of tetraspores in July and August. 
Geogr. Distrib. Known only from the southern part of the Atlantic region of the 
Polar Sea. 
Locality: The Norwegian Polar Sea: Nordlanden, common and abundant. This is 
the northernmost known locality of the species. The form coronata has been found 
together with the typical form. 
Gen. Ptilota (Ac.) J. G. Aa. 
Spec. Alg. 2, p. 92; Ag. Syn. Alg. p. XIX: ex parte. 
Ptilota elegans Bonne. 
Hydr. loc. p. 22, sec. J. G. Spec. Alg. 2, p. 94. 
Descr. Ptilota elegans J. G. Ac. Epicr. p. 74. 
Fig. » sericea Harv. Phye. Brit. t. 191. 
Eesicc. » elegans ArescH. Alg. Scand. exsicc. N:o 11. 
Syn. Ptilota elegans Kieen, Nordl. Alg. p. 20; excl. syn. 
Habitat. The present species is litoral, pelagic, and somewhat gregarious, and 
usually grows on steep rocks between tides under beds of Mucus and Ozothallia, or on the 
walls of grotto-shaped cavities, which it covers, in company with Delesseria alata, with 
a dense mat. Even on the coast of Finmarken it reaches a considerable size. | have 
seen very luxuriant individuals more than 10 cm. high near North Cape. In the Nor- 
wegian Polar Sea it bears tetraspores during the summer, sporocarps in August. 
Geogr. Distrib. This species belongs to the Atlantic region of the Polar Sea. Its 
most northern known locality is Gjesvwr about Lat. N. 71°. 
Localities: The Norwegian Polar Sea: Nordlanden, scarce. Finmarken: Maasé, 
Gjesver, Oxfjord, local, but pretty abundant. 
