KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 20. N:u 5. 109 



f. tenuissima Rupe. (nob.) 



Fuscaria tenuissima Eupr. Alg. Och. p. 221. 



«. prolifera nob. 



f. fronde prioris anni a ramis persisteutibus prolifera. 

 Beser. Fuscaria tenuissima Rupr. 1. c. 

 Fig. » » » tab. 10. 



fi. glacialis nob. 

 Descr. Rhodomela tenuissima Kjellm. Spetsb. Thall. 1, p. 6. 

 Fig. » « » )) « tab. 4, fig. 1 — 2. 



Eåcsicc. » » i> in Aresch. Alg. Soand. exsicc. N:o 402. 



Syn. Aphanarthron cladostephus J. G. Ag. Spetsb. Alg. Bidr. p. 9. 

 Fucus lycopodioides Gunn. Fl. Novv. 2, p. 80. 

 » » Wg. Fl. Lapp. p. 505. 



» subfuscus » » » » » Cfr. .\resch. Obs, Phyc. 3, p. 7. 



Fuscaria tenuissima Eupr. Alg. Och. p. 221. 

 Rhodomela cladostephus J. G. Ag. Spetsb. Alg. Till. p. 48. 

 » lycopodioides J. G. Ag. Grönl. Alg. p. 111. 



» » Aresch. Phyc. Scand. p. 262. 



» « Kjellm. Spetsb. Thall. 1, p. 8; Algenv. Murm. Meer. p. 10 



» » Kleen, Nordl. Alg. p. 12. 



» » Nyl. et Siel. Herb. Fenn. p. 74. 



)> subfusca (var?) J. G. Ag. Spetsb. Alg. Progr. p. 3; Bidr. p. 11. 



)) » DicKiE, Alg. Cumberl. p. 238. 



» » GoBi, Algenfl. Weiss. Meer. p. 24. 



» rt Kjellm. Spetsb. Thall. 1, p. 5. 



» » Kleen, Nordl. Alg. p. 12. 



>) » Post. et Rupr. 111. Alg. p. II. 



» tenuissima Kjellm. Vinteralg. p. 64; Spetsb. Thall. 1, p. 6; i\.lgenv. Murm. Meer. p. 



10 et Kariska hafvets Algv. p. 19. 



Remark on the species. GoBi, in his account of the Flora of the White Sea, has 

 defended the opinion entertained also by other algologists, that, Shodonuin lycoj^odioides 

 is not specifically distinct from Rh. subfusca (Woodw.) Ag. In support of this opinion 

 he alleges, firstly that these two forms of Rhodomela, taken for different species, agree 

 perfectly in anatomical structure and differ only by outward characteristics, amongst 

 which is a somewhat different variety of colour, secondly that there are to be found 

 transitions between them, as has been pointed out already by Harvey, and lastly that Rh. 

 subfusca, whose distribution is more southerly, changes gradually in habit as it advances 

 towards the north, passing into that Rh. lycopodioides which is characteristic of higher 

 latitudes. x4.mongst the transitional forms that Rhodomela ought to be numbered 

 according to Gobi, which has been named Fuscaria tenuissima by Rupbecht and whose 

 claim to be regarded as a separate species I have tried before to justify. 



I cannot but accede to this view so far on the one side, as to allow the claim 

 of Rh. tenuissima to be considered as a separate species to fall. My observations and 

 studies of its forms as occurring in the south-eastern part of the Siberian Sea, compel 



