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. 



(p.) Thinner, large, purplish color. Iridaa. 



(c.) 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. 



{p.) 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 iu the other. 



