A Monograph of the Gemis Alaria. IQ3 



(JÖNSSEx) : Greenland side of Baffin Bay ; Julianshaab, Sukkertop- 

 pen, Jakobshavn, Claushavii (J. Agardh) : North-west coast of Nortli 

 America from Unalaska to Paget Sound ; Kadiak Island, Orca 

 (Setchell), Kukak Bay, Prince William Sound, Glacier Bay 

 (Saunders), Yancouvei' Island (Lyall, Haevey). 



Alaria crassifolia KjELL>r. 

 (Plate IX, fiirs. 1-3 ; Plate X, figs. 1-3; Plate XVIII, figs. 1-18.) 



KjELLM, odi Petersen : Om Japau-s Lamin., p. 276, Tab. X, fig. 

 9-12.— De Toni : Syll. Alg. in, p. 330.— Oka mura : On Laini- 

 naria of Japan, p. 99. — Miyabe : Lamin, of Hokkaido, j). 54, PL 

 23 (in Japanese). 



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

 tion. Blade linear-lanceolate, 0.5-1.5 meters in length, 5-20 cm. 

 in breadth, membranaceous but leather-like when old, richly frosted 

 with cryptostomata on both surfaces, margin entire, splitting in 

 the older parts of the blade obliquely or almost transversely to- 

 wards the midrib ; base of blade generally acute, \mi often abrupt- 

 ly expanded at some distance above the transition point ; tip of 

 blade narrowed above, pinnately cleft and generally rouglily eroded 

 away. Stipe 4-15 cm. in length, cylindrical below, 2-3 mm. in 

 diameter, gradually terete and broadened above, measuring 3-4 

 mm. in width, but quickly narrowed at the transition point ; lower 

 half of the length naked, upper and compressed part except the 

 narrowed region bearing the sporophylls. Midrib smooth, com- 

 planated, 2-6 mm. broad, elevated, often prominent above the blade 

 on both surfaces with angulate edges, continuous to the stipe be- 

 low. Sporophylls, metasoric, -numerous, pinnately arranged on both 

 margins of the complanated part of the stipe, a few lowermost 



