1925 1 Setchell-Ga/rdner: Mvlanophyceae 593 



St. Michaels, and Golofin Bay on the Alaskan coast. It is credited by 

 Postels and Rnprecht (1840, p. 19) to Sitka and Unalaska, by Saunders 

 (1901, p. 424) to Popof Island and Prince William Sound, and by 

 MacMillan (1902, p. 219) to the Straits of Juan de Fuca. The last 

 locality is not verified by any specimens, so far as we know. Such 

 specimens as we have seen do not differ from those of the North 

 Atlantic. 



family 20. LAMINARIACEAE reichenb. 



Fronds simple, composed of holdfast, stipe and blade, at least in 

 the earlier stages, never with true dichotomous branching of the stipe, 

 adventitious or false branching arising in a few cases from the blade, 

 composed of the usual three tissues; mucilage glands and passages 

 present or absent; blades destitute of cryptostomata (or bunches of 

 hairs) ; sori extended, always on the blade, paraphyses with hyaline 

 appendages. 



Reichenbach, Conspect. Reg. Veg., 1828, p. 29 (fide Pfeiffer). 



We have adopted the family of the Laminariaceae in restricted 

 sense as including those members of the Laminariales having the prin- 

 cipal meristematic region situated at the summit of a more or less well 

 developed stipe, at the base of a flattened blade, and initiating neither 

 splitting nor outgrowths, of or from, either the stipe or the blade. In 

 the simplest genera (e.g., Laminaria) the transition place is perfectly 

 plane, but in some genera folds (e.g., Pleurophycus and Cijmathaere), 

 in others ribs (e.g., Costaria and Agarum) are developed, while in 

 some genera (Costaria, Agarum, and ThalassiophyUum) bullosities and 

 resulting perforations are the final results of its activity. In certain 

 species the center of the blade wears away to the transition place which 

 extends and growing on, produces two false branches each with half a 

 blade attached {Hedophyllum subsessile and ThalassiophyUum) . It 

 has seemed best to group the various genera into tribes according to 

 these various methods of behavior. 



Key to the Tribes 



1. Blades without perforations, longitudinal ribs or folds, occasionally bullose.... 2 



1. Blades with perforations, longitudinal ribs or folds 3 



2. Stipe persistent 1. Laminarieae (p. 594) 



2. Stipe early disappearing 4. Hedophylleae (p. 616) 



3. Blades with longitudinal folds 2. Cymathaereae (p. 606) 



3. Blades with longitudinal ribs or perforations 3. Agareae (p. 609) 



