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I. De Candolle's 'Phyllode Theory" 466 3. The relation of the ' Phyllode Theory ' to the theory of the origin of Monocotyledons through adaptation to the geophilous habit 468 3. The relation of the ' Phyllode Theory ' to the theory of the aquatic origin of Monocotyledons . . . . . . . . . . . . . . . 469 4. The ' L a m i n a ' in certain Monocotyledonous leaves . . . . . . . . 470 6. An extension of the ' Phyllode Theory ' to the leaves of certain Gymnosperms . . . 473
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Agnes Arber (1918) studied this question.
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