154 KJELLMAN, THE ALGAE OF THE ARCTIC SEA. 
f. ramosa nob. 
Planta annotina solitaria, thalli parte cauloidea parce vage ramosa, axi primario ramisque prolificationes 
simplices, raro fureatas, distantes usque digitales et ultra, diametro 0,5—2 mm.,, tetrasporangiis maturis deji- 
ciendas emittentibus. 
Fig. Halosaccion ramentaceum f. ramosa tab. nostra 13, fig. 4. 
@. major 0b. 
Prolificationes digitales et ultra, diametro circa 2 mm. 
Syn. Fucus tubulosus Lepecu. Comment. Petrop. p. 476. 
~. minor nob. 
Prolificationes pollicares, diametro 0,5—1 mm. 
f. subsimplex Rupr. 
Ales Och: pe 270. 
Descr. Halosaccion soboliferum var. subsimplex Rupr. 1. ce. 
Fig. » ramentaceum f. subsimplex tab. nostra 13, fig. 3. 
f. densa nob. 
Descr. Scytosiphon ramentaceus Lynes. Hydr. Dan. p. 61. 
Fig. Fucus ramentaceus Turn. Hist. Fuc. t. 149. 
Ezsicc. Halosaccion ramentaceum Arescu. Alg. Scand. exsice. N:o 205. 
Syn. Dumontia Lepechini Posr et Rupr. Ill. Alg. p. II. 
» ramentacea ARESCH. Phye. Scand. p. 313. 
» » Nyl. et Sel. Herb. Fenn. p. 74. 
» sobolifera Dicxre, Alg. Sutherl. 2, p. 191. 
Fucus barbatus Gunn. Fl. Norv. 2. p. 129. 
» ramentaceus Gunn. Fl. Norv. p. 79. 
» » We. Fl. Lapp. p. 504. 
Gracilaria confervoides J. G. AG. Spetsb. Alg. Bidr. p. 11, sec. spec. 
» » @ procerrima Post. et Rupr. Ill. Alg. p. II—III sec. Rupr. Alg. Och. p. 274, 
Halosaccion fistulosum Rupr. Alg. Och. p. 273. 
» ramentaceum J. G. Ac. Spetsb. Alg. Progr. p. 3; Bidr. p. 11; Gronl. Alg. p. 111. 
» » Croati, Fl. Dise. p. 460. 
» » Dickte, Alg. Cumberl. p. 239; Alg. Sutherl. 1, p. 143. 
» » Gos, Algenfl. Weiss. Meer. p. 38. 
» » Harv. Ner. Amer. 2, p. 194. 
» » KsELLM. Vinteralgv. p. 64; Spetsb. Thall. 1, p. 17; Algenv. Meer. p. 17. 
» » KurEn, Nordl. Alg. p. 18. 
» soboliferum Rupr. Aue. Och. p. 268. 
Halymenia ramentacea LinpBu. Bot. Not. p. 157. 
Scytosiphon ramentaceus Lynes. Hydr. Dan. p. 61. 
Soliera chordalis Asum. Alg. Hayes, p. 96(?) Cfr. Fart. New Engl. Alg. p. 148. 
Remark on the definition of the form. Halosaccion ramentaceum is a very multiform 
species in the Arctic Sea. The forms I have recorded and tried to characterize above 
are far from being the only ones that occur, but the others may be grouped round 
them. Though it may certainly seem as if the form named by me f. robusta and the 
