|Basic info||Taxonomic history||Classification||Included Taxa|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|P. Gerrienne et al. 2018||Herbaceous-like plant with isotomously branched axis ending in a compact strobilus. Vegetative leaves persistent, long, acute, with a deep-sunken midvein and spiny margin. Leaves of the widest axes borne in a low helix; leaves on the vegetative portions of the fertile axes borne in pseudowhorls. Exarch, solid primary xylem cylinder, with several peripheral ridges of protoxylem; primary xylem surrounded by a complete layer of secondary xylem including rays. Strobilus composed of a central axis bearing densely placed sporophylls. Presence of micro- and of putative megaspores, but mono- or bisporangiate nature of strobili unknown. Sporophylls disposed in a low helix or in pseudowhorls. Sporophylls consisting of a sub-horizontal proximal portion (pedicel) and a long distal (sub)vertical lamina. Pedicel devoid of alation and of keel. Pedicel bearing one sporangium on its adaxial surface. Sporophyll lamina with trichome-like appendages on its margin. No ligule has been observed.|