Sporangia scattered over the lower surface of the lamina, or 2-3(-4) fused into synangia in the axils of 2-lobed scale-like or leaf-like appendages, or rarely in terminal strobili, then the sporangia hanging from a peltate structure. Monilophyta
Plants growing in soil, mud or epiphytic
Plants not aquatic
Stems articulate with whorled, 1-veined leaves fused into a nodal sheath Equisetaceae
Stems not articulate with several-veined leaves or, if the leaves are 1-veined, then not whorled