VII.—Eurystoma trigonasp. nov., a Pteridosperm ovule borne on a frond ofAlcicornopterisKidston
- 1 January 1969
- journal article
- research article
- Published by Cambridge University Press (CUP) in Transactions of the Royal Society of Edinburgh
- Vol. 68 (7), 171-182
- https://doi.org/10.1017/s0080456800014654
Abstract
Ovules of Eurystoma trigona sp. nov. are described. Over 330 unpollinated ovules were found attached to a petrified megasporophyll which appears to be a juvenile form of Alcicornopteris Kidston. Each ovule is triangular in cross section and has three wing-like extensions of the integument. None shows a female prothallus. The possibility that Alcicornopteris represents the fertile foliage of Stenomyelon is discussed.Keywords
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