KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. N:0 5. 191 



navian algologists. Lyngbye 1. c. has described it so well that it is perfectly easy to 

 identify it. 



Habitat. This species grows between tides, f. umbilicalis near high-water mark, 

 always attached to rocks and stones, f. typica farther down, often fastened to stones, 

 sometimes to algae. They occur at exposed as well as sheltered places, f. umbilicalis 

 preferring, however, the former. Being somewhat gregarious, it occurs sometimes in so 

 great masses as to influence the character of the vegetation. Both forms bear propa- 

 gative organs on the arctic coast of Norway in July and August. 



Geogr. Distrib. The species certainly belongs properly to the Atlantic province 

 of the Polar Sea, having its maximum of frequency there, but it has been observed 

 also in the adjoining parts of the Polar Sea. Its northernmost known locality is Gje- 

 svaer on the north coast of Norway, Lat. N. about 71°. 



Localities: The Norwegian Polar Sea: Nordlanden, common and abundant; Fin- 

 marken, pretty common and abundant at Maas5, Gjesvter, the south coast of MagerO, 

 Oxfjord, and Talvik. 



The Murman Sea: the coast of Russian Lapland, probably pretty common and 

 plentiful. 



Baffin Bay: the coast of Greenland, according to specimens in the herbarium of 

 the Copenhague Museum. 



Both the forms occur on the coast of Norway; on the coast of Russian Lapland 

 f. umbilicalis has been observed, on the coast of Greenland f. typica. 



Porphyra abyssicola nob. 



P. fronde elongato-obovata, late oblonga vel ovato-cordata, integra, parce at profunde undulata vel sub- 

 plana, lubrica, chartae arctissime adhserente, coccineo-violacea, dioica; organis fructificatioiiis zonara marginalem 

 occupantibus. Tab. 17, fig. 4; tab. 18, fig. 10—11. 



Syn. Porphyra miniata J. G. Aa. Gronl. Alg. p. Ill; fide spec. 



» » Gobi, Algenfl. Weiss. Meer. p. .51; fide syn. 



» » Kleen, Nordl. Alg. p. 23; fide spec. 



» » Nyl. et Seel. Herb. Fenn. p. 75. 



Description of the species. I have seen only a few individuals of this species, 

 among which only two were complete. It is attached by means of a small callus ra- 

 dicalis. Stipes wanting. Both the complete specimens are elongated-obovate, somewhat 

 oblique. As far as I have been able to judge from the fragmentary specimens, the 

 form of the alga is, however, often another than this. Some of those specimens seem 

 to have been broadly oblong, others ovate with cordiform base. The largest specimen 

 I have examined, was 15 cm. long and 5 cm. broad in its broadest part. The fragments 

 seem also to indicate smallness of size. The plant is sometimes almost smooth, some- 

 times scantily, but deeply, plicate. It is more gelatinous than any other species of the 

 genus, adhering closely to the paper in preserving, and contracting but little in drying. 

 Younger individuals have a rather strong carmine colour inclining to violet. When be- 

 coming older, the plant pales, assuming a pallid, yellowish flesh-colour (tab. 17, fig. 4). 



