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I.—Sphærostoma ovale (Conostoma ovale et intermedium, Williamson), a Lower Carboniferous Ovule from Pettycur, Fifeshire, Scotland

Published online by Cambridge University Press:  06 July 2012

Margaret J. Benson
Margaret J. Benson
Affiliation:
Professor of Botany in theUniversity of London, Head of the Department of Botany at theRoyal Holloway College, Englefield Green, Surrey.
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Extract

The Palæozoic ovule, to which the generic name “Sphærostoma” is now given, was originally described by Williamson in 1877 under the names Conostoma ovale and Conostoma intermedium. He referred sections of different individuals to different species owing to the imperfect condition of the material then available, but expressed the view that Conostoma intermedium “may possibly be a state of Conostoma ovale.” The new material has rendered this interpretation a certainty. With respect to the reference of this ovule to the genus Conostoma, Williamson again expresses some hesitation, merely stating that “it appears to be of the same generic type.” The genus Conostoma was established for an Upper Carboniferous ovule which Williamson designated Conostoma oblongum.

Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 50 , Issue 1 , 1914 , pp. 1 - 17
Copyright
Copyright © Royal Society of Edinburgh 1914

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References

page 1 note * Williamson, Eighth Memoir, Phil. Trans., 1877, pp. 244 and 245.

page 1 note † Oliver, and Salisbury, , “On the Structure and Affinities of the Palæozoic Seeds of the Conostoma Group,” Annals of Botany, vol. xxv. No. xcvii.Google Scholar, Jan. 11.

page 2 note * Oliver and Salisbury, loc. cit., p. 38.

page 6 note * Oliver, and Scott, , “On the Structure of the Palæozoic seed Lagenostoma Lomaxii,” Trans. Roy. Soc, (Lond.), 1904 (p. 217).Google Scholar

page 6 note † Oliver and Scott, loc. cit., pl. x. fig. 28 B.

page 10 note * Kidston, , “On the Microsporangia of the Pteridospermeæ,” Trans. Roy. Soc., 1906, vol. cxcviii. p. 423.Google Scholar

page 11 note * Williamson, loc. cit., pl. xii. fig. 83.