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Keywords from Image Description:
Diatomaceae of Philadelphia Plate . follows PLATE Fig Pinnularia gentilis Donk Cl Pinnularia viridis Nitzsch Pinnularia dactylus var dariana Cl Pinnularia viridis var fallax Cl Pinnularia socialis Palmer Pinnularia stuarii Cl Pinnularia rectangulata Greg Cl Pinnularia trigonocephala Cl Pinnularia major Kuetz Wm Sm small