364 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 3 



PLATE 33 



Sargassum Johnstonii and form gracile, variation in leaves, vesicles, 

 and "inflorescences," x 3.75. 



Figs. 1-2. Dawson 355. 



Figs. 3-5. Form gracile, Dawson 340. 



Figs. 6-8. Form gracile, Marchant 28. 



Figs. 9-13. Form gracile, Dawson 63. 



Figs. 14-16. Form gracile, Marchant 28a. 



Figs. 17-19. Dawson 476. 



Figs. 20-22. Immature, Dawson 314a. 



