New Zealand Journal of Botany abstracts

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A COMPARISON OF THE CAMBIUM IN TWO WOODS WITH INCLUDED PHLOEM:
HEIMER-LZODENDRON BRUNON1ANUM AND AVICENNIA RESINIFERA

W. P. Studholme and W. R. Philipson

Botany Department, University of Canterbury, Christchurch

Abstract The principal differences between the cambium of Heimerliodendron and that of a normal dicotyledon are: (a) the differentiation of longitudinal strands of phloem within the zone of meristematic cells, and (b) the absence of a permanent initial layer. Evidence for these differences is derived from longitudinal radial and tangential sections. Secondary thickening in Avicennia is due to a succession of cambia, each of which functions in a normal manner, but for a limited time. The first of these supernumary cambia arises by divisions of the inner cells of the cortex, but subsequent cambia in Avicennia arise within derivatives of the preceding cambium. A comparison of the cambium in these two genera emphasises that the secondary thickening of Heimerliodendron is of a distinctive type.

(Received for publication 8 July 1966) N.Z.Jl Bot.4: 355-65

PDF file of entire paper: medium quality (2673K); (scanned from paper original: notes about this process)

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