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TEXTBOOK OF BOTANY 



Fig. 286. Eight species of diatoms differing in structure and symmetry. Genera 

 represented: A, Amphipleura; B, Sitrirella; C, Pinniilaria; D, Trihrachia; E, 

 Arachnoidiscus; F, Eimotia; G, Stictodiscus; H, Coscinodiscus. Photos from Paul 

 Conger, Smithsonian Institution, except A from Bausch & Lomb Optical Co., and 

 E from Spencer Lens Co. 



