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Transkei 1990 "Fossils: 1st set of the series"
Issue Date 18.01.1990 ID Michel: 246-249 Scott: 231-234. Stanley Gibbons: 245-248 Yvert: 246-249 UPU: N/A Category: pF Author Lambert Kriedemann Stamps in set 4 Value 18c Ginkgo koningensis
30c Pseudoctenis spatulafa
40c Rlssikia media
50c Taeniopteris anavolans
Size (width x height) Layout Offset Products FDC x1 Paper Perforation 14.25 x 14 Print Technique Printed by Quantity Issuing Authority
Palaeobotany, the study of fossil plants, is a comparatively young science. lt is based on the discovery that ancient vegetable matter preserved in rocks often includes fragments of plants belonging to genera, orders and even classes which no longer exist. The countryside in Transkei, 200 million years ago, was not hilly as it is today but was part of a vast inland plain far from any coastline and traversed by many meandering rivers bordered by riverine forest belts. Excellently preserved fossil plants of this age occur in the Molteno Formation along the higher western border regions of Transkei. The four fossils illustrated in this set of stamps derive from this geological horizon.
The genus Ginkgo was first described by the Swedish botanist Linnaeus in 1771. He is justly considered to be the father of modern biological classification and it was he who introduced the system of naming plants by genus and species that it is used throughout the world today. There is only one species of Ginkgo, namely G. biloba, that still exists today. It is indigenous only to a small area in China, but specimens are now growing in many botanical gardens and elsewhere. There are many fossil species belonging to the genus and these have been collected all over the world. The species from the 200 million year old Molteno Formation in Transkei illustrated here is one of the very earliest.
In addition to the ginkgos, cycads, conifers and a prominent class of extinct plants known as the seed ferns, a number of genera (e.g. Taeniopteris) occurred which are known only from their leaves and cannot be reliably classified in one of the well-established orders of gymnosperms. Taeniopteris anavolans, although a rare element of that early Transkei vegetation, produced some of its most conspicuous foliage. The role that this species with its large strap-shaped leaves played in the ecology cannot be established today. lt may have occurred in open bush or dense forest, but it is easiest to imagine it as a leafy shrub in the shady undergrowth of riverine forests. .
Text: Dr J.M. Anderson, National Botanical institute Lexlines
References: Inside text of FDC
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