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Lower Carboniferous pteridosperm cupules and the origin of angiosperms

Published online by Cambridge University Press:  06 July 2012

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

Four new petrified specimens of cupules assigned to Hydrasperma cf. tenuis Long are described from the Cementstone Group of Oxroad Bay, East Lothian. In one of these specimens four ovules are present. Three of the specimens are interpreted as representing a pair of cupules derived from a single megasporophyll showing dichotomy so that each cupule is termed a hemi-cupule and has two lobed halves which represent quarters of the entire megasporophyll. In the fourth specimen five cupules are present, each possessing two lobed halves not sub-divided into quarters. Hydrasperma is thus interpreted as showing two kinds of cupules designated mega-cupules and paired hemi-cupules. The theory is developed that angiosperm carpels have evolved from the two kinds of pteridosperm cupules.

Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 70 , Issue 1-3 , 1977 , pp. 13 - 35
Copyright
Copyright © Royal Society of Edinburgh 1977

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