KONGL. SV. VET. AKADEMIENS HANDLINGATl. BAND. 20. N:0 5. 201 



Fucus ceranoides L. 

 Spec. Plant. 2, p. 1158. 



f. typica nob. 

 Descr. Fucus ceranoides Harv. Pliyc. Brit. t. 271. 

 Fig- » » Hauv. 1. c. at Kleen, Nordl. Alg. t. 10, fig. 4. 



f. Harveyana Dcsne nob. 



Voyage Venus t. 4. 



Descr. Fucus Harveyanus J. G. Ag. Spetsb. Alg. Bidr. p. 10 et Till. p. 43. 

 Fig- » ceranoides Kleen, Nordl. Alg. t. 10, fig. 2. 



f. divergens J. G. Ag. nob. 



Fucus divergens J. G. Ag. Gronl. Lam. och Puc. p. 28. 

 Descr. Fucus divergens J. G, AG. 1. c. 

 Fig. » ceranoides Kleen, Nordl. Alg. t. 10, fig. 1. 



Syn. Fucus ceranoides Lyngb. Hydr. Dan. p. 5; fide syn. quoad spec. Groenl. Q). 

 » » SoMMEKF. Suppl. p. 182; fide syn. 



Bemark on the forms of this species. Since I have seen the excellent and highly- 

 instructive series of forms of Fucus ceranoides which Kleen has brought home from 

 Nordlandeu, and had the opportunity of comparing these forms with the two forms of 

 Fucus found in the Arctic Sea proper, F. Harveyanus and F. divergens, I cannot but 

 adopt Kleen's opinion that these two must not be regarded as independent species, 

 but are, in fact, forms of F. ceranoides. However, these forms occurring independently 

 in widely distant parts of the Arctic Sea, I have thought best to set them down under 

 the names once attributed to them. 



Habitat. In the Norwegian Polar Sea, this alga is litoral, growing in such places 

 where salt water is mixed with fresh water. F. divergens appears in almost fresh 

 water. About its mode of occurrence in the Arctic Sea I know only what is stated by 

 J. G. Agardh, who follows Berggren, namely that f. divergens grows on the west coast 

 of Greenland »in scrobiculis». In Kleen's collections there are many individuals with 

 receptacles. They have been collected in July and August. I have seen specimens 

 with receptacles of f. Harveyana from Spitzbergen and of f. divergens from Greenland. 

 These had also been gathered in summer, in July and August. 



Geogr. Distrib. The plant is known from isolated parts of the Atlantic and the 

 arctic regions of the Polar Sea. In neither of these seas it is commonly spread. The 

 northernmost locality where it has been found is the coast of Spitzbergen. 



Localities: The Norwegian Polar Sea: Nordlanden (fif. typica, Harveyana, and di- 

 vergens) at several places. 



The Greenland Sea: the coast of Spitzbergen; the exact place is not stated (f. Harveyana). 



Baffin Bay: the west coast of Greenland at Rittenbenk (f. divergens). I doubt 

 that Lyngbye's Fucus ceranoides from Greenland is the present species. In the her- 

 barium of the Copenhague Museum there is no form to be found that can be referred 

 to F. ceranoides. 



K. Vet. Akad. Handl. Band. 20. N:o 5. .^D 



