KEY TO THE GENERA OF THE PACIFIC 

 COAST.* 



I. Frond Membraneous. 



I. Frond plain, mostly undivided, smooth, or 



roughened only by seed vessels. 



{a.) Thick, large, reddish brown. 



Sarcophyllis. 



(b.) Thinner, large, purplish color. Iridcea. 

 (<;.) Undivided, branched or cleft; brown, 

 purple, or green. Grateloupia. 



2. Frond thick, covered with pappili. 



Undivided, forked or irregularly branched, 

 deep red, or purple. Gigartina. 



3. Frond narrower, thick, leathery, smooth. 



Sword-shaped leaflets from side or end 

 of main frond ; dark red brown. 



Prionitis Andersonii. 

 4. Frond much divided. 

 (a.) Thin, deeply lobed, or forked, mostly 

 dark red ; not adhering well. 



Nitophyllum . 

 {b.) Thicker, more intricately divided, more 

 brilliant red color, adheres. 



Callophyllis. 



Only those Genera which have species peculiar to the Pacific Coast are in- 

 cluded in this Key, the rest will be found in the other. 



