g4 Vol. XLIII. Art. 1.— K. Yendo : 



(Epurecht) ; Ajan Bay (Ruprecht) ; Petropaulowsk, Kamtschatka 

 (LüTKE, Postées and Euprecht) ; ?Kukak Bay (Saunders, under 

 Ä. lalicostd) ; Tonnaicha, Sakhalin(!). 



Alaria ocJwtensis sp. nov. 

 (Plate III, figf^. 1-5 ; Plate XTX, figs. 1-3.) 

 Drßnition of the species. Poot, li(3ldfast of dendritic ramifica- 

 tion, with fihform rhizines. Blade linear-lanceolate, more than 2.5 

 meters in length, 25-30 cm. in width at the broadest part, mem- 

 branaceous, extremely thin when dried, finely transversely corru- 

 gated in the matured forms, frosted with numerous cryptostomata ; 

 margin entire, undulated or crispated, splitting in the older parts 

 transversely to the midrib ; base of blade acute from an early 

 stage of development, tip of blade narrowed above, pinnately split 

 and usually worn away. In the cortical layer of the blade, pecu- 

 liar, ramified glandular cells present, the content of whicli turns 

 brownish on drying, giving the blade a characteristic brown colour. 

 Stipe short, 3-4 cm. in length, terete or cylindrical below, gradual- 

 ly broadened and complanated above, narrowed again at tlie 

 transition point, naked for a short length near the base, bearing 

 sporophylls on the margins of the complanated part. INIidrib com- 

 planated, with slanting edges, 0.7-1.3 cm. broad, elevated above 

 the blade equally on both surfaces, continuous with the stipe 

 below. Sporophylls, holosoric, 30-40 in number, pinnately arranged 

 on both margins of the complanated part of the stipe, a few 

 lowermost ones more or less independent, but middle and upper ones 

 starting from a narrow continuous wing on each margin of the stipe, 

 adding new ones successively upwards, lanceolate or linear-cuneate, 

 10-15 cm. long, 2.0-2.5 cm. wide in the broadest part; base of 

 sporophylls acute, often obtuse, very often oblique, ending in a 



