A Monograph of the Geniis Atarin. 39 



Atari a dolichorhachis Kjki.lm. 



(Plate V.) 



Algae of Arct. Sra, p. 2.7, PI. 20-21, 25, fig. 11-18.— Id. : Bering- 

 hafv. Al^fl., p. 3:-.— D;-: ïoNi : Sdi. Alg. Ill, p. 328.— Setch. et 

 Gakd. : Alg. N. W. Amer. p. 272. 



= Alana elllptica Kjellm. : Alg. Aret. Sea, p. 221, PI. 23, PI. 



25, fig. 2.5, 2G.— De Toni : Syll. Alg. Ill, p. 329. 



= AJaria eriqja Kjellm. : Beriiighafv. Algfl., p. 37, Tub. 3, fig« 



5-7.— De Tom : Syll. Alg. Ill, p. 330. 

 — Alaria mnsafolia J. Ac. in litt. Herb. J. AoARU.'f. (laiituni 



spe^iineu Spitzbergeusis). 

 = Alaria Pijlall J. Ag. : Bidrag till Käm.edoni Spctzborg. Alger, 

 p. 30 (uoii iilior). 

 '? — Alaria esculenta Hah v. : Flora West Esk., p. 49 (.sec K jell- 

 man). 

 ? = Alaria esculenta var. latifolia f. singular is llurn. (Hcr!<. Acad. 

 Potropol.). 



Definition of the species. Root, holdfast of dendritic ramifica- 

 tion. Blade ovate-lanceolate, 1 meter or less in length, up to 40 

 cm. in width at the broadest part, thin, membranaceous, crypto- 

 stomata wanting ; base of blade cuneate for a short length, abruptly 

 expanding upwards into a broad roundish shape. Stipe up to 20 

 cm. in length, cylindrical below, 3-4 mm. in diameter, terete and 

 broadened above, narrowed below the transition point. Midrib 

 smooth, 4-7 mm. broad, prominent with roundish edges. Sporo- 

 phylls, holosoric ?, numerous, pinnately arranged on both margins 

 of the terete part of the stipe, a few lowermost ones at wide in- 

 tervals but the middle and upper ones approximate and distinct, 

 long cuneate, attaining 20 cm. in length, tapering towards the base 

 into slender petiole, 2.0-3.5 cm. broad near the rounded apex, 

 papyraceous, with plicate margins. 



Remarks on the affinity icith other species. Kjellman mentioned 



