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Supposedly Colpate Pollen Grains from the Jurassic

Published online by Cambridge University Press:  01 May 2009

R. A. Couper
R. A. Couper*
Affiliation:
Sedgwick Museum, Cambridge.
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Abstract

Some Mesozoic spores and pollen grains claimed in a recent publication to exhibit angiosperm-like features are discussed. It is suggested that Poroplanites Pflug, is actually a trilete fern spore. The “ germinal apparatus ” of the Poroplanites type is simply an optical section of the characteristic folding of a lobe of a trilete spore, flattened along the polar axis and seen in equatorial view. It is shown that Pflug's Poroplanites type can be reproduced almost exactly in the trilete spores of a living tree fern. Classopollis Pflug, Circumpollis Pflug, and Canalopollis Pflug are pollen grains with distinct annular thickening, similar to the pollen grains of the Jurassic araucarian, Pagiophyllum connivens Kendall.

Type
Research Article
Information
Geological Magazine , Volume 92 , Issue 6 , December 1955 , pp. 471 - 475
Copyright
Copyright © Cambridge University Press 1955

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References

REFERENCES

Couper, R. A., 1953. Upper Mesozoic and Cainozoic Spores and Pollen Grains from New Zealand. N.Z. Geol. Surv. Pal. Bull., 22, 1–77.Google Scholar
Harris, T. M., 1944. Notes on the Jurassic Flora of Yorkshire, 13–15. Ann. Mag. Nat. Hist., Ser. 11, xi, 661–690.CrossRefGoogle Scholar
Kendall, M. W., 1952. Some Conifers from the Jurassic of England. Ann. Mag. Nat. Hist., Ser. 12, v, 583–594.Google Scholar
Pflug, H. D., 1953. Zur Enstehung und Entwicklung des Angiospermiden Pollens in der Erdgeschichte. Palaeontographica, Abt. B. 95 (4–6), 60–171.Google Scholar
Wilson, S., and Yates, J., 1953. On Two Dicksoniaceous Ferns from the Yorkshire Jurassic. Ann. Mag. Nat. Hist., Ser. 12, vi, 929–937.CrossRefGoogle Scholar