KONGL. SV. VET- AKADEMIENS HANDLINGAK. BAND. 20. N:0 5. 139 



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

 Epicv. p. 446; GiiEV. Alg. Brit. p. 77; lira. raut. 



Nitophyllum punctatum (Stackh.) Geev. 

 Alg. Brit. p. 79. Ulva punctata Stackh. Linn. Trans. 3, p. 236. 

 Descr. Nithophylluna punctatum J. G. Ag. Spec. Alg. 2, p. 659. 



Remark on the determination of the species. In the collection of algaj belonging 

 to the Copenhagen Museum there are two specimens, sterile and fragmentary, of a Nito- 

 phyllum, taken, according to the label affixed by Wormskiold, on the coast of Green- 

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

 resemble N. punctatum in structure and agree in habit with the plant figured by KiJT- 

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

 ferred to JV^. punctatum cc ocellatum by J. G. Agardh (Epicr. p. 448), I believe I may 

 denominate them N. punctatum. 



Habitat unknown. 



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

 have stated above. 



Fam. HILDBRANDTIACE^ Hauck. 



Meeresalg. p. 13. 



Gen. Hildbrantia Nardo. 

 Isis 1834, p. 675. 



Hildbrandtia rosea KuTZ. 

 Phyc. gener. p. 384. 



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



Fig. » » KiJTZ. Tab. Phyc. 19 t. 91. 



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



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



» » Kjellm. Spetsb. Thall. 1, p. 4; Algenv. Murm. Meer. p. 8. 



I) » Kleen, Nordl. Alg. p. 12. 



Habitat. It covers smaller stones, sometimes alone, sometimes together with other 

 alga?, usually Lithoderma fatiscens. On the coast of Norway it occurs within the litoral 

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

 — 10 fathoms water, most often belonging to the formation of Lithoderma. 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 



