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A Systematic Histological Study of Palm Fruits. II. The Areca Alliance

Frederick B. Essig and Bradford E. Young
Systematic Botany
Vol. 4, No. 1 (Spring, 1979), pp. 16-28
DOI: 10.2307/2418662
Stable URL: http://www.jstor.org/stable/2418662
Page Count: 13
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A Systematic Histological Study of Palm Fruits. II. The Areca Alliance
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Abstract

Pericarp structure in the ten genera of the Areca alliance is more heterogeneous than in the Ptychosperma alliance, but with some species closely approaching the ptychospermate condition. The endocarp is generally less well-defined, although composed of the same tissue types. Fibrovascular bundles functioning as part of the endocarp tend to be more dispersed among mesocarp tissues, sclerified ground tissue is less prominent, but the locular epidermis shows about the same range of variation. Four different types of exocarp are found in the group: 1) a layer of brachysclereids; 2) a layer of brachysclereids plus fibrous bundles; 3) a series of fibrous bundles alone; 4) a dense layer of specialized tanniniferous cells. Fibrous bundles can occur among the vascular bundles, or as separate series in the middle or outer pericarp. The alliance appears to be taxonomically divisible into two groups, on the basis of presence or absence of brachysclereids in the exocarp. Other minor taxonomic suggestions are made.

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