170 



by the possession of cylindrical, annuiate, and more or less dicho- i 

 tomously branched stipes bearing orbicular blades or laminae, at j 

 first pettate or nearly so, later perfoliate, entire or more or less ra- 

 diatcly split, and by the possession of nemathecia containing zonate ^' 

 letraspores accompanied by unicellular paraphyses: i 



3). That C. rosa marina (Gmelin) P. & R. and C. Silchensis P. 

 & R. are ide.itical species: 



4). That the C. Silchensis of llarvey' s Northwest Algae is an 

 undescribed species for which the name C. subulifera'xs proposed : 



5). That the genus is confined to the Northern Pacific Ocean 

 and the Bering Sea, C. rosa marina extending from the Kurile Islands 

 and islands of Bering Sea to the coasts of Alaska, C. simplex exten- 

 ding from the coast of Oregon south along the upper and middle 

 coast of California, and C. subiilifera occupying the intermediate re- 

 gions in the neighborhood of Puget Sound.. 



Analytical Key to the Species. 



A. Proliferation rosulate, i. e., the internode between the forming 

 biade and the next older one short, at least, at first : 



1. Adult internodes longer than thick C. rosa marina P. & R. 



2. Adult internodes shorter than thick C. simplex Setchell 



B. Proliferation subuliform, i. e., the internode between the for- 

 ming biade and the next older one, long even from the very first: 



3. Adult internodes longer than tfiick C. subulifera sp. nov. 



Constantinea rosa marina (Gmelin) P. & R. 



Postels and Ruprecht, 111. Alg., p. 17, 1840. 



Principal synonymy. 



Fiicìis rosa marina, Gmel., lli^t. Fucorum, p. 102, 17Ó8. 



Constanlinea Silchensis, Postels and Ruprecht, 111. Alg., p. 1 7, [ 



1840. 1: 



Kallymenia rosa marina, Fndlichcr, Gcn. Plantarum, Suppl. Ili, 

 p. 40, 1843. 



— Silchensis, Endlicher, loc. cit. 



