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see Lepidodendron and SigillariaLepidodendron and Sigillaria
, two principal genera of an extinct group of primitive vascular trees. They dominated the forests of the early Carboniferous period until the ferns gained ascendancy.
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



the subterranean rootlike part of the trunk of arborescent Lycopodiophyta that existed in the end of the Paleozoic. Stigmariae consisted of thick, dichotomous axes (rhizo- phores) with spirally attached appendixes (roots), which left scars after falling off. Layers with large numbers of stigmariae often formed in the areas of maritime mangrovelike thickets. The presence of stigmariae in geological deposits is an indicator of a frost- less climate.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Realizing that the stigmarian roots were part of the plants that made up the coal seams, Logan communicated his observations to the Geological Society of London in February 1840 and later published them as an abstract in the Proceedings (Logan 1840) and in full in the Transactions (Logan 1842a).
Forested horizons of calamitacean and lepidodendrid trees standing in their growth position are observed at many levels, with large stigmarian rooting systems.