lycopsida การใช้

The Early Jurassic ( Hettangian-Sinemurian ) flora is represented by Bryophytes ( Hepaticae ), Pteridophytes ( Filicopsida, Sphenopsida, Lycopsida ) and Gymnosperms ( Pteridospermopsida, Ginkgopsida, Cycadopsida, Coniferopsida ), with numerous coal generators ( Givulescu, 1998, Popa and Van Konijnenburg-Van Cittert, 2005 ).
""'Asteroxylon " "'( " star-shaped xylem " ) is an extinct genus of vascular plants of the Division Lycopodiophyta known from anatomically preserved specimens described from the famous Early Devonian Rhynie chert and Windyfield chert in Aberdeenshire, Scotland . " Asteroxylon " is considered the most basal member of the Lycopsida.
The species is known only from the Rhynie chert in Aberdeenshire, Scotland, where it grew in the vicinity of a silica-rich hot spring, together with a number of associated vascular plants such as a smaller species " Rhynia gwynne-vaughanii " which may be interpreted as a representative of the ancestors of modern vascular plants and " Asteroxylon mackei ", which was an ancestor of modern clubmosses ( Lycopsida ).