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Perforation Plate Strucrure in Comptonia Peregrina (Myricaceae)

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The sequential development of vessel elements in the primary and secondary xylem of Comptonia peregrina (L.) Coult. was studied. Scalariform, transitional, simple and scalaroid perforation plates were common in this species. The structural variation of these plates was interpreted on the basis of some developmental factors such as: I) width of the ceJl face and the distance between helical gyres; 2) type and distribution of secondary wall material in the form of strand, sheet or both; 3) localised and differential deposition of wall material and bar breakdown. These factors may work alone or in combination to determine the perforation plate structure.


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