KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. N:0 5. 139 
Gen. Nitophyllum (Grev.) J. G. Ac. 
Kpicr. p. 446; Grev. Alg. Brit. p. 77; lim. mut. 
Nitophyllum punctatum (Sracku.) Grey. 
Alg. Brit. p. 79. Ulva punetata Sracku. Linn. Trans. 3, p. 236. 
Descr. Nithophyllum punctatum J. G. AG. Spee. Alg. 2, p. 659. 
Remark on the determination of the species. In the collection of alyw belonging 
to the Copenhagen Museum there are two specimens, sterile and fragmentary, of a .Vito- 
phyllum, taken, according to the label affixed by WormskioLp, 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 Ktr- 
zING (Tab. Phyc. 16. t. 85) under the name of Aglaophyllum delicatulum, which is re- 
ferred to N. punctatum © ocellatum by J. G. AGarpu (Epicr. p. 448), I believe I may 
denominate them . punctatum. 
Habitat unknown. 
Geogr. Distrib. and Localities. Nothing more is known on these points than | 
have stated above. 
Fam. HILDBRANDTIACEA! Hauck. 
Meeresalg. p. 13. 
Gen. Hildbrantia Nanrvo. 
Isis 1854, p. 675. 
Hildbrandtia rosea Kwrz. 
Phye. gener. p. 384. 
Descr. Hildbrantia rosea J. G. Aa. Epiecr. p. 379. 
Fig. » » 6 Korg. Dab. Phyc: 19) t., 91. 
Eesicc. » »  ArescH. Alg. Scand, exsice. N:o 159. 
Syn. Hildbrantia rosea Gon, Algenfl. Weiss. Meer. p. 23. 
» »  KyeLim. Spetsb. Thall. 1, p. 4; Algenv. Murm. Meer. p. 8. 
» »  Kugen, Nord]. Alg. p. 12. 
Habitat. It covers smaller stones, sometimes alone, sometimes together with other 
alge, usually Lithodermu 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 45 
—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 
