Archaeopteris

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Archaeopteris

[‚ärk·ē′äp·tə·rəs]
(paleobotany)
A genus of fossil plants in the order Archaeopteridales; used sometimes as an index fossil of the Upper Devonian.
References in periodicals archive ?
Do the Ophioglossales represent ferns as traditionally interpreted, or are they derived from progymnosperms, as hypothesized by Bierhorst (1971) and others (e.
in press) with a compression macrofloral record comprising cordaitalean gymnosperms, pteridosperms, ferns and putative progymnosperms (Calder et al.
What is more, progymnosperms were discovered and defined and have become a leading candidate as coniferophyte ancestors.