The presence of flavonoids has not hitherto been found in the ferns but such compounds were found to be widely distributed in this plant. A large amount of flavonoids was found in the Ophioglossaceae, Hymenophyllaceae and
Cyrtomium, Thelypteris Pteris, Rumohra, and
Dryopteris genera of the Polypodiaceae families, while practically none was found in the
Athyrium Diplazium, and
Asplenium genera. The color of the flavonoids given in the Tables is in the following order: Under ordinary light and ultraviolet light of the untreated substance, under ultraviolet light after spraying of magnesium acetate solution, under ordinary light and ultraviolet light after spraying of sodium carbonate solution.
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