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Publication Date

1971

Keywords

Myrica

Abstract

ABSTRACT- The vessel members of Myrica escu/enta from two_ trees, one in Sarawak, the other in Singapore, are described. The differences in habitat as well as in vertical position in each-tree have a minor influence on dimensional characteristics of the vessel members. However, radial position is very significant. Average length of element increases from 600μ, to 950μ, b~tween .05 cm from the pith to 1.75 cm from the pith and then ceases to elongate appreciably. Average diameter over the same radial distance increases from 30μ, to l 05μ. Also over the same radial distance, the average number of perforations of the end-wall decreases from 16 to 7 and the average end-wall angle increases from 14° to 42 °. In these respects Myrica escu/enta has primitive to intermediate vessel members. The data provide a basis for evaluation of the evolutionary status of the other species of the Myricaceae which are available to us only in the form of fragmentary wood specimens.

First Page

72

Last Page

76

Primo Type

Article

Included in

Botany Commons

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