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



navian algologists. Lyngbye 1. c. bas described it so well that it is perfeetly easy to 

 identify it. 



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

 always attached to rocks and stoiies, f. typica farthcr down, often fasteiied to stones, 

 sometiiiies to alga?. They occur at exposed as well as sheltered places, F. umbilicalis 

 preferring, howcvcr, tlic former. Beiiig somewhat gregarious, it occiirs somctiines in so 

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

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



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

 of tlie Polar Sea, having its maxiuium of frequency there, hut it has beeii observcd 

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

 sva^r 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 Maasö, Gjesva>r, the sonth coast of Magerö, 

 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 tlie herbarium of 

 the Copenhague Museum. 



Both the forms occur on the coast of Norwaj'; on the coast of Russian Lapland 

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



Porphyra abyssicola nob. 



P. froiule elongato-obovata, late oblonga vel ovato-corciata, integra, parce at profunilc undulata vel sul)- 

 plaua, liibrioa, chartse arctissime adhierente, cocciueo-violacea, dioiea; organis fnictificatioiiis zoiiam niargiiialcm 

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



Syn. Porphyra rainiata J. G. Ag. Grönl. Alg. p. 111; fide spec. 



» I) GoBi, Algenfi. Weiss. Meer. p. .51; fide syn. 



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



» " Nyl. et Ssel. Herb. Penti. 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 eallus 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 

 r 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, somc- 

 tiines 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 strony carmine colour inclinincf to violet. When be- 

 coraing older, the plant påles, assuining a pallid, yellowish flesh-colour (tab. 17, fig. 4). 



