KONGL. SV. VET. AIvADEMIENS HANDLINGAK. 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. 



Habitat. 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. Distrih. 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. 

 Baffin Bay: Cumberland Sound (?), the west coast of Greenland.. 



Gen. Phyllopliora (Geev.) J. G. Ag. 



Alg. Med. p. 93; Geev. Alg. Brit. p. 135; lira. mut. 



Phyllophora Brodisei (Turn.) J. G. Ag. 

 1. c. Fucus Brodisei Turn, Hist. Tue. 2, p. 1. 

 Descr. Phyllophora Brodiiei J. G. Ag Epicr. p. 216. 

 Fig. » » Harv. Phyc. Brit. tab. 20, fig. 1. 



Exsicc. M » Aeesch. Alg. Scand. exsicc. N:o 207. 



Syn. Ghondrus membranifolius Post, et Eupr. 111. Alg. p. II. sec. Gobi, Algenfl. Weiss. Meer, p. 42 — 43. 

 » truncatus Post, et Eupr. 111. Alg. p. II. 



Coccotylus Brodisei Zellee, Zweite d. Polarf. 85. 

 Fucus truncatus Pall. Eeise 3, p. 34. Cfr. Gobi, Algenfl. Weiss. Meer. p. 43 et Ag. Spec. Alg. 



1, p. 239. 

 Phyllophora Brodieei (?) J. G. Ag. Spetsb. Alg. Progr. p. 3; Bidr. p. 11. 

 » » Gobi, Algenfl. Weiss. Meer. p. 42. 



» » Kjellm. Spetsb. Alg. Thall. 1, p. 23; Algenv. Murm. Meer. p. 21; Kariska 



hafvets Algv. p. 22. 

 » » Nyl. et Ssel. Herb. Fenn. p. 74. 



Sphserococcus Brodisei SoHtJBELEii, in Heugl. Eeise p. 317. 



Remark on the S2)ecies. 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. Brodicei. I have 

 collected specimens of the same character also on the west coast of Novaya Zemlya, 

 and Gobi 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. Brodicei 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 Ph. Brodicei — has had its origin from the other. But as they are 



