86 Yül. XLIII., Art. 1.— K. Temlo : 



Alaria pvœlonga KJELL^r. 



(Plato IV, figs. 1-5.) 



Ojn Beringhafv. Algfl., p. .'38, Tab. 4, fig. 1-4. —De Toni: Syll. 

 Alg. III, p. 330. 



= Phasganon alatum Rupr. : Tange och. Meer., p. 355, 359. p.p. 

 = Phasganon alatum var. latifolium Rüpe. : Ditto, ]:>. 355, pp. 

 = Alaria esculenta P, et K. : III. Alg., p. 11, j>.^>. 

 = Alaria yessoensis Miyabe : Lamin. of Hokkaido, p. 54, PI. 23. 

 ^* — Alaria lanceclala Coll., Holden et Setcil : Phye. ßor.-Amer. 

 ra,=c. B. No. XLIV. 



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

 tion. Blade linear, 1-7 meters, generally 2-3 meters in length, 

 10-13 cm. in breadth, coriaceous, cryptostomata wanting, margin 

 entire, splitting obliquely to the midrib in the older parts ; base 

 of blade gently tapering ; tip narrowed above, pinnately cleft and 

 generally roughly worn away. Stipe 3-12 cm. in length, sub- 

 cylindrical below, 2.5-3.0 mm. in diameter, gradually com}3ressed 

 above, measuring 3-5 mm. in width, but quickly narrowed at the 

 transition point ; lower half of the length naked, upper and com- 

 pressed part, except the narrowed region, bearing sporophylls. 

 Midrib smooth, complanated, 5-13 mm. broad, elevated above the 

 blade on both surfaces with roundish edges, continuous with the 

 stipe below. Sporophylls, holosoric, 12-40 or often more in num- 

 ber, pinnately arranged on both margins of the complanated part 

 of tlie stipe, a few lowermost ones at wide intervals, but middle 

 and upper ones approximate and regularly disposed, adding new 

 ones successively upwards, linear-oblong or linear, 6-20-30 cm. in 

 length, 1.5-2.5 cm. in breadtli, with well defined cylindrical petioles ; 

 base of sporophyll obtuse, very frequently asymmetrical ; tip 

 roundish or obtuse. Sorus on both surfaces of each sporophyll. 



