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A Systematic Histological Study of Palm Fruits. I. The Ptychosperma Alliance

Frederick B. Essig
Systematic Botany
Vol. 2, No. 3 (Autumn, 1977), pp. 151-168
DOI: 10.2307/2418257
Stable URL: http://www.jstor.org/stable/2418257
Page Count: 18
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A Systematic Histological Study of Palm Fruits. I. The Ptychosperma Alliance
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Abstract

The fruit of the eight genera of the Ptychosperma alliance have complex sclerenchymatous endocarps that typically consist of a palisade layer derived from the locular epidermis, some sclerified ground tissue, and vascular bundles with thick fibrous sheaths. Highly integrated endocarps appear to have evolved in at least six different lines in the alliance, and unspecialized forms can be found in several genera. The exocarp consists of fibrous bundles and brachysclereids, and also shows varying degrees of integration. Although it is difficult to separate the large genera from one another upon pericarp characters alone, small genera, subgenera, and groups of species often separate readily, suggesting that the major taxonomic application of data from the pericarp will be at the infrageneric level in this alliance.

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