451 
Rhodomela Agardh. 
1. Rhodomela subfusea (Woodw.) Agardh. 
C. A. Agardh, Sp. Ale. I, 1821, p. 378, emend.; Harvey, Phyc. Brit. Vol. III 1851 pl. 264; J. Agardh, 1863 
p- 883; Areschoug, Obs. phyc. III 1875, p. 6. N. Act. R. Soc. Ups. Ser. III Vol. X; Kjellman, N. Ish. 
Algfl. 1883 p. 146 (113); Kolderup Rosenvinge 1884, p. 33; 1902 p. 360; 1903 p. 459; Falkenberg 
1901, p. 593 Taf. 11 Figs. 2—17; Kylin 1907, p. 145; id. 1923 p. 114. 
Fucus subfuscus Woodward, Linn. Transact. I, 1791, p. 131, tab. 12; Hornemann, Flor. Dan. tab. 1543, 
1816. 
Gigartina subfusca (Woodw.) Lamx.; Lyngbye Tent. 1819, p. 47, Tab. 10, 11. 
Lophura gracilis Kützing Phyc. gen. 1843, p. 435, Taf. 53 IV. 
Lophura cymosa Kützing Phyc. gen. p. 435; Tab. phyc. XV Tab. 36. 
@, genuina. 
Rh. subfusca Kjellm. I. c.; Kylin, 1. c. 
8, lycopodioides (L.) Gobi. 
C. Gobi, Alg. weiss. Meeres. Mem. Acad. Imp. St. Petersbourg VII® ser. t. 26, 1878, p. 24. 
Fucus lycopodioides Lin. Syst. Nat. ed. 12, tom. II p. 717. 
Rhodomela lycopodioides Agardh Sp. Alg. I 1822 p. 377; J. Agardh, 1863, p. 885. 
Gigartina lycopodioides Lyngbye Tent. p. 45. 
Conferva squarrosa Oeder Flor. Dan. tab. 357, 1767. 
y, virgata (Kjellm.) nob. 
Rhodomela virgata Kjellman N. I. Algfl. 1883 p. 143 (110) tafl. 7; Kylin, 1907 p. 147; id., Stud. üb. die 
Entw. v. Rhod. virg. Sv. bot. Tids. Bd. 8 1914 p. 33. 
0, tenuior (C. Agardh) Svedelius. 
C. Agardh, Synops. Alg. sc. 1817 p. 32; Svedelius 1901, p. 124. 
Rh. subfusca f. gracilior J. Ag. Gobi, Rothtange Finn. Meerbus. 1877 p. 11. 
e, abyssicola nob. Plate VI figs. 2—4. 
From old time the Rhodomelas occurring at the shores of Northern Europe have 
been referred to the two species Rh. subfusca and Rh. lycopodioides, the near relation 
of which to one another has been emphasised by several authors. In 1883 KieLr- 
MAN tried to show that the first of these species must be divided into two corres- 
ponding with the forms extratæniensis and intratæniensis distinguished by ARESCHOUG 
in 1875. The latter, to which he gave the name Rh. virgata, is distinguished by the 
following characters: The vernal plant of the first year does not become black by dry- 
ing and is flattened while Rh. subfusca becomes black and keeps cylindrical. The main 
axes are distinctly thickest in the middle and in their whole length bear branches 
gradually decreasing in length upwards, while Rh. subfusca has pronounced branch- 
lets with limited growth. All these branches are shed in summer, the main axes 
only remaining. The organs of reproduction arise in winter on the branchlets which 
grow out on the long shoots from the previous winter, and which are shed after 
