KONGL. öV. VET- AKADEMIENH IIANDLINGAK. BAND. 20. N:0 5. 139 



Gen. Nitophyllum (Gkev.) J. G. Ao. 



Epior. p. 446; Grev. Alg. Brit. p. 77; lim. mut. 



Nitophyllum puuctatuin (Stackii.) Grev. 

 Alg. Brit. p. 79. Ulva punctata St.vgkh. Lian. Traus. 3, p. 236. 

 Descr. Nithophyllum puiictatum J. G. Ag. Spec. Alg. 2, p. 659. 



Reinarh un the determination of the species. In thc collection of algai belougiug 

 to the Copenhagen Museum there are two specimeris, sterile and fragmentaiy, of a Nito- 

 pliyllum, taken, according to the label affixed by Wormskiolu, on the eoast of Green- 

 land. I have not been able to determine the species vvith certainty, but as the specimens 

 resemble N. inmctatuia in structure and agree in habit with the plant figured by KuT- 

 ziNG (Tab. Phyc. 16. t. 35) under the name of Äglaophylluin delicatulum, which is re- 

 ferred to N. inmctatum cc ocellatum by J. G. Agaedii (Epicr. p. 448), I believe I may 

 denominate them N. punctatum. 



Hahitat unknown. 



Geogr. Distrib. and Localitics. Nothing more is known on these points than I 

 have stated above. 



Fam. HILDBRANDTIACEiE Hauck. 



Meeresalg. p. 13. 



Gen. Hildbrantia Nakdo. 



Isis 1834, p. 675. 



Hildbrandtia rosea KuTZ. 

 Phyc. gener. p. 384. 



Descr. Hildbrantia rosea J. G. Ag. Epicr. p. 379. 



Fij. » » KuTZ. Tab. Phyc. 19 t. 91. 



Exsicc. » )) Aresch. Alg. Scand, exsicc. N:o 159. 



Syn. Hildbrantia rosea GoBi, Algenfl. Weiss. Meer. p. 23. 



n » KjELLM. Spetsb. Thall. 1, p. 4; Algeiiv. Murm. Meer. p. 8. 



» » Kleen, Nordl. Alg. p. 12. 



Hahitat. It covers smaller stones, sometimes alone, sonietimes together Avith otlier 

 alga3, usually Lithodernia fatiscens. On the coast of Norway it occurs vvithin the litoral 

 zone, in other parts of the Polar Sea I have found it within the sublitoral zone in 5 

 — 10 fathouis water, most often belonging to the formation of Lithoderm.a. It grows at 

 exposed as well as sheltered parts of the coast. Specimens with spores have been 

 taken in June in the Arctic Sea on the west coast of Novaya Zemlya, in the middle 

 af August at Finmarken. 



Geogr. Distrib. It is found in the Atlantic as well aS the arctic region of the 

 Polar Sea, but it is only little spread within the latter. Its maximum of frequency 



