288 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 17 



"Key TO THE SPECIES OF Callophyllis of the Pacific Coast 



OF North America 



"1. Cystocarps on terminal segments only 2 



1. Cystocarps marginal (or on lateral lobes )only .... [4] 



[1. Cystocarps largely on the "disc" of the frond 9] 



2. Congested at the very tips, projecting . C. acrocarpa 



2. Subterminal, on ultimate laciniae 3 



3. Immersed C. flabellulata 



3. Projecting C. fiUcina 



4. On tips of lateral lobes . . . C. odonthalioides 



4. Along the margins 5 



5. Mostly projecting from the margins 6 



5. Just within the margins 7 



6. Frond over 400 /a thick . . . . C. crassifolia 

 6. Frond under 400 ju, thick . . . . C. marginifructa 



7. Margins of the frond finely crisped 8 



7. Margins plane and entire C. gardneri 



8. Cystocarps scattered C. stenophylla 



8. Cystocarps croM^ded C. thompsonii 



9. Margins crisped, laciniate, or proliferous 10 



9. Margins nearly or completely entire 11 



10. Margins crisped C. crenulata 



10. Margins crowded with narrow, slender, compound 



laciniae C. plumosa 



10. Margins with regular, broad, stalked pinnules C. pinnata 



11. Frond dichotomous below, pinnate above 12 



11. Frond dichotomous throughout 13 



12. Fronds under 400 /* thick, cystocarps small C. violacea 



12. Fronds over 600 fj. thick, cystocarps large C. megalocarpa 



13. Frond thin (under 200 ii thick) . . . C. heanophylla 



13. Frond medium thick (200-300 /x thick) . . C. dissecta 



13. Frond thick (500-700 fi thick) . . . . C. obtusifolia" 



Key to the Mexican Species of Callophyllis 



1. Cystocarps borne on or just within the margins of the blades 2 

 1. Cystocarps scattered over the surfaces of the blades ... 3 

 2. Segments mostly 4-7 mm. wide in middle and lower parts, 

 but successively reduced from older to younger parts 

 C. marginifructa 



