KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. N:o 5. 187 



Subg. 2. TMmniscus Kjellm. 



Spetsb. Thall 1, p. 29. 



Rhodochorton mesocarpum (Carm.) nob. 

 Callitliamnion raesocai-pum Oakm. iu Hook. Brit. Fl. 2, p. 3d8. 



f. rupicola nob. 

 Descr. Thamnidium mesocarpum Kleen, Norell. Alg. p. 22. 

 Fig. Callithamnion » Harv. Pliyc. Brit. t. 325. 



f. penicilliformis Kjellm. 



Spetsb. Thall. 1, p. 30. 

 Descr. Thamnidium mesocarpum f. penicilliformis Kjellm. 1. c. 



Fig. » » i> >> tab. nostra 16, fig. 6 — 7. 



Syn. Thamnidium mesocarpum Kleen, Nordl. Alg. p. 22. 



» » f. penicilliformis Kjellm. 1. c; Algeuv. Murm. Meer. p. 25; Kariska 



hafvets Algv. p. 23. 



Addition to the descrvption of f. penicilliformis. In general the appearance of this 

 plant is tliat represented by fig. 6. I have always found it such within the Arctic Sea. 

 On the coast of Finmarken among such individuals I have, besides, observed others 

 whose priraary branches bore a greater number of secund or alternate, appressed branches. 



Habitat. The form rupicola is litoral or sublitoral, attached to stones, Bryozoa, 

 muscles a. o. The form penicilliformis is sublitoral and epiphytic on several algse, chiefly 

 species of Odontlialia, Delesseria, and Ptilota, and Chastomorpha melagonium. It has been 

 met with hitherto only on exposed coasts, always few specimens. Both the forms 

 have been found with tetrasporangia in July and August, f. penicilliformis, besides, at 

 Greenland in March. 



Geogr. Distrib. The typical form is known only from the Atlantic province of 

 the Polar Sea, f. penicilliformis also from the arctic region, within which it is widely 

 diffused. Its most northern known locality is Fairhaven on tlie north-west coast of 

 Spitzbergen, Lat. N. 79° 41'. 



Localities: The Norwegian Polar Sea: Nordlanden (f. rupicola) local, scarce; Fin- 

 marken at GjesvEer (f. penicilliformis) local, scarce. 



The Greenland Sea: the north-west coast of Spitzbergen at Fairhaven, local, scarce. 



The Murman Sea: on the west coast of Novaya Zemlya at several places pretty 

 plentiful. 



The Kära Sea: Uddebay on the east coast of Novaya Zemlya. 



Baffin Bag: the west coast of Greenland at Julianeshaab. 



Rhodochorton spetsbergense Kjellm. 



Spetsb. Thall. 1, p. 31. 

 Descr. Thamnidium spetsbergense Kjellm. 1. c. 

 Fig. » » » t. 1, fig. 11, 12. 



