XIV.—Some Lower Carboniferous Fructifications from Berwickshire, together with a Theoretical Account of the Evolution of Ovules, Cupules, and Carpels
- 1 January 1966
- journal article
- Published by Cambridge University Press (CUP) in Transactions of the Royal Society of Edinburgh
- Vol. 66 (14) , 345-375
- https://doi.org/10.1017/s0080456800023668
Abstract
Synopsis: Two new species of petrified seedsEosperma edromense, andAnasperma burnensegen. et sp. nov. are described from the Cementstone Group of Berwickshire.Anaspermashows that the anatropous condition existed among Palæozoic ovules; it has a single integument with two lateral apical lobes.Rachides ofStauropteris berwickensissp. nov. and associated megasporangia are also described.An account is given of the theory of the telomic origin of the first ovular integument. The second (outer) integument in Angiosperm ovules may therefore have evolved after the establishment of anatropy, either from the first integument or as an overgrowth of the chalaza. Evidence is cited to support the theory that Angiosperm carpels have evolved from dorsiventral bivalved cupules.Keywords
This publication has 51 references indexed in Scilit:
- VI.—On the Cupule Structure of Eurystoma angulareTransactions of the Royal Society of Edinburgh, 1965
- XV.—On Protopitys (Göppert): with a Description of a Fertile Specimen Protopitys scotica sp. nov. From the Calciferous Sandstone Series of Dunbartonshire.Transactions of the Royal Society of Edinburgh, 1958
- The Structure and Affinities of Pachytesta Illinoense comb. nov.American Journal of Botany, 1954
- The morphology of Stauropteris burntislandica P. Bertrand and its megasporangium Bensonites fusiformis R. ScottPhilosophical Transactions Of The Royal Society B-Biological Sciences, 1952
- XXV.—Calathospermum scoticum—An Ovuliferous Fructification of Lower Carboniferous Age from DunbartonshireTransactions of the Royal Society of Edinburgh, 1949
- XII.—On Tetrastichia bupatides: A Carboniferous Pteridosperm from East LothianTransactions of the Royal Society of Edinburgh, 1938
- I.—A Study of the Vascular Supply to the Carpels in the Follicle-bearing RanunculaceæTransactions of the Royal Society of Edinburgh, 1937
- THE NATURE AND ORIGIN OF THE STIGMANew Phytologist, 1934
- I.—Sphærostoma ovale (Conostoma ovale et intermedium, Williamson), a Lower Carboniferous Ovule from Pettycur, Fifeshire, ScotlandTransactions of the Royal Society of Edinburgh, 1914
- VII. On the structure of the palœzoic seed lagenostoma lomaxi , with a statement of the evidence upon which it is referred to LyginodendronPhilosophical Transactions of the Royal Society of London. Series B, Containing Papers of a Biological Character, 1905