KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. N:0 5. 163 
shed from the former by its greater thinness, less dense central layer, thicker cortical 
layer, and more superficial sporocarps. The latter differs by its richer prolification and 
differently shaped sporocarps. 
Halitat. The only fact known as to its habitat is that the plant has been taken 
in 15—20 fathoms water on a bottom of slate-shingle. 
Geogr. Distrib. The species is known from the American province of the arctic 
region. Its northernmost known locality is Assistance Bay in arctic America, Lat. N. 
74° 40’. 
Localities: The American Arctic Sea: Port Kennedy and Assistance Bay. 
Bafjin Bay: Cumberland Sound (?), the west coast of Greenland. 
Gen. Phyllophora (Grev.) J. G. Ac. 
Alg. Med. p. 93; Grev. Alg. Brit. p. 135; lim. mut. 
Phyllophora Brodizi (Turn.) J. G. Ac. 
l. c. Fucus Brodizi Turn, Hist. Fue. 2, p. 1. 
Descr. Phyllophora Brodiwi J. G. AG Epicr. p. 216. 
Fig. » » Harv. Phyc. Brit. tab. 20, fig. 1. 
Exzsice. » » Arescu. Alg. Scand. exsice. N:o 207. 
Syn. Chondrus membranifolius Post. et Rupr. Ill. Alg. p. I. sec. Gost, Algentl. Weiss. Meer, p. 42—43. 
» truncatus Post. et Rupr. Ill. Alg. p. II. 
Coccotylus Brodiewi Zeiten, Zweite d. Polarf. 85. 
Fucus truncatus Paty. Reise 3, p. 34. Cfr. Gosr, Algenfl. Weiss. Meer. p. 43 et AG. Spec. Alg. 
iy peecod: 
Phyllophora Brodizi (?) J. G. Ac. Spetsb. Alg. Progr. p. 3; Bidr. p. 11. 
» » Gos1, Algenfl. Weiss. Meer. p. 42. 
» » KsELLM. Spetsb. Alg. Thall. 1, p. 23; Algenv. Murm. Meer. p. 21; Kariska 
hafvets Algv. p. 22. 
» » Nyl. et Sel. Herb. Fenn. p. 74. 
Spherococeus Brodizi ScHUBELER, in Heugl. Reise p. 317. 
Remark on the species. Already in my account of the marine vegetation of Spitz- 
bergen I have mentioned that I have found there a certain form of Phyllophora which 
may be referred with as good reason to Ph. interrupta as to Ph. Brodiwi. I have 
collected specimens of the same character also on the west coast of Novaya Zemlya, 
and Gost has found others of the same habit amongst the collections of alga from the 
White Sea and the western Murman Sea examined by him. Even on the west coast 
of Norway I have seen a Phyllophora of rare occurrence, most individuals of which 
coincided with the Ph. Brodiwi occurring in Kattegat, while some resembled the arctic 
P. interrupta with regard to the shape of some of the branches. It cannot be doubted 
that these two species are very closely allied to each other. Probably one of them — 
in my opinion PA. Brodi#i — has had its origin from the other. But as they are 
