Sphenopsida

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Sphenopsida

a subdivision of the Tracheophyta, including the horsetails(Equisetum).
References in periodicals archive ?
This led to a worldwide change from hydric conditions to mesic conditions which are less favorable to sphenopsid growth.
Botanical affinities of isolated palynomorphs included in this paper indicate the presence of sphenopsids (Equisetopsids) and ferns (Osmundaceae) during the early Permian period along with gymnosperms (Cycadales, Benniettitales).
Also present are the sphenopsids Trizygia speciosa, Phyllotheca australis and Benlightfootia sp.
Previous authors did not mention any representatives of the sphenopsids in red sediments of the Lodeve Basin.