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Structurally Preserved Fossil Plants from Antarctica. III. Permian Seeds
Thomas N. Taylor and Edith L. Taylor
American Journal of Botany
Vol. 74, No. 6 (Jun., 1987), pp. 904-913
Published by: Botanical Society of America, Inc.
Stable URL: http://www.jstor.org/stable/2443871
Page Count: 10
You can always find the topics here!Topics: Ovules, Flora, Pollen, Integument, Antarctic regions, Cell walls, Embryos, Seeds, Plant anatomy, Human organs
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Small, anatomically preserved gymnospermous seeds are detailed from late Permian age silicified specimens collected in the Beardmore Glacier region of Antarctica. The seeds are platyspermic with prominent, sarcotestal wings and a simple pollen chamber. The integument consists of a narrow endotesta, a two-parted sclerotesta and a complex sarcotesta. In mature seeds, the nucellus is present as a papery layer, separated from the endotesta by a nucellar and endotestal cuticle. Cellular megagametophytes are present in many of the seeds and commonly contain two archegonia. A multicellular embryo is present within each archegonium. The embryos are at a similar stage of development and provide evidence of simple polyembryony in these seeds. Although the affinities of the seeds are not presently known, they are discussed in the context of other seeds described from Gondwana deposits, as well as the known flora from the Beardmore Glacier area.
American Journal of Botany © 1987 Botanical Society of America, Inc.