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Text-book of botany, morphological and physiological. Botany. FlG. 377.—A pollen-sac oiAlthaa rosea seen from the side, m the archesporium; B transverse section of an anther- lobe showing the two pollen-sacs, m
Botany of the living plant. Botany. THE STAMEN AND POLLEN-SAC 247 drying as the anther ripens is that their thin outer waUs shrinlc, while the thick inner wall retains its form.
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