Abstract
The variation in length of cell elements both in bark and wood of a few tropical trees (Mangifera altissima, Mansonia altissima, Pentacme contorta, Pterocarpus marsupium, Shorea megrosensis, Shorea squamata, Triplochtion scleroxylon) is described. The phloem fibres and sieve tube members show a tendency for increase in length from periderm to cambium, just as the wood fibres and vessel members increase from pith to cambium. The phloem fibres are generally longer than wood fibres (40–70%). In woods with storeyed cambia the sieve tube members exhibit no variation, retaining a constant length throughout the width of the bark; the phloem fibres possess the normal trend of a length increase from periderm to cambium. The length variation of sieve tube members and phloem fibres with the height of the tree generally exhibits a decreasing trend from butt to top, although a slight increase in length of phloem fibres at the top was noticed.
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