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Showing papers by "Margaret E. Collinson published in 1992"

Journal Article•DOI•
Colloidal crystal-like structure of sporopollenin in the megaspore walls of Recent Selaginella and similar fossil spores.

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Alan R. Hemsley1, Alan R. Hemsley2, Margaret E. Collinson3, Margaret E. Collinson2, Anthony P. R. Brain3 •
University of Montpellier1, Royal Holloway, University of London2, King's College London3
01 Apr 1992-Botanical Journal of the Linnean Society
TL;DR: It is concluded that colloids and their precursors may play a far more significant part in spore and pollen wall structure than was previously believed.

57 citations

Journal Article•DOI•
The early fossil history of Salicaceae: a brief review

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Margaret E. Collinson1•
University of London1
01 Jan 1992-Proceedings of The Royal Society B: Biological Sciences
TL;DR: The earliest records of the modern Salicaceae are from North America with Populus section Abaso in the Late Palaeocene and Salix subgenus Salix in the early Eocene.
Abstract: Current evidence for early fossil Salicaceae is summarised. Most data come from Europe and North America where revisionary studies are in progress in several laboratories. The earliest records of the modern genera are from North America with Populus section Abaso in the Late Palaeocene and Salix subgenus Salix in the early Eocene. This evidence is based mainly on leaves but the presence of Populus is confirmed by a leafy shoot with attached fruiting raceme. The two genera first occur later in Europe with Populus in the uppermost Eocene and Salix in the Middle Oligocene. Members of both genera in both continents apparently occupied riparian habitats early in their history.

55 citations