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

Cambridge University Press (CUP) - Tập 50 Số 1 - Trang 1-17 - 1914
Margaret Benson1
1Professor of Botany in the University of London, Head of the Department of Botany at the Royal Holloway College, Englefield Green, Surrey.

Tóm tắt

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.

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Tài liệu tham khảo

Kidston, 1906, On the Microsporangia of the Pteridospermeæ, Trans. Roy. Soc., cxcviii, 423

Oliver, 1904, On the Structure of the Palæozoic seed Lagenostoma Lomaxii, Trans. Roy. Soc, 217

Oliver, On the Structure and Affinities of the Palæozoic Seeds of the Conostoma Group, Annals of Botany, xxv, xcvii

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Cambridge University Press (CUP)

Tập 50 Số 1

1-17

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