Abstract
POLLEN grains with the same shape, approximate size-range and exine characters as those of Ephedra and Welwitschia have been found recently in certain Lower Tertiary deposits in south-eastern Australia. The pollen grains of Ephedra and Welwitschia1 are characterized by the more or less prominent longitudinal ridges into which the exine is raised, and the structureless nature of the exine itself; but, whereas those of Welwitschia have a distinct germinal furrow, the pollen grains of most species of Ephedra have no furrow. The absence of a furrow from the Australian fossil pollen grains in question suggests that they are more closely related to Ephedra than to Welwitschia.
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COOKSON, I. Pollen Grains of the Ephedra Type in Australian Tertiary Deposits. Nature 177, 47–48 (1956). https://doi.org/10.1038/177047a0
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DOI: https://doi.org/10.1038/177047a0
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