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Fig.
7.2-12b. Transverse section of rhizome of a fern (Pteridium).
Like Fig. 7.2-12a, this excellent section shows more bordered
pits in transverse section. These must be scalariform pits, because
the pits are almost as wide as each contact face; if they were circular bordered
pits, the contact faces would appear to be beaded.
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