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VII.—Eurystoma trigona sp. nov., a Pteridosperm ovule borne on a frond of Alcicornopteris Kidston

Published online by Cambridge University Press:  06 July 2012

Albert G. Long
Affiliation:
Hancock Museum, Newcastle upon Tyne.

Synopsis

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.

Type
Research Article
Copyright
Copyright © Royal Society of Edinburgh 1969

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References

References to Literature

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