Noun | 1. | Selaginellales - in some classifications included in Lycopodiales plant order - the order of plants class Lycopodiate, class Lycopsida, Lycopodiate, Lycopsida - club mosses and related forms: includes Lycopodiales; Isoetales; Selaginellales; and extinct Lepidodendrales; sometimes considered a subdivision of Tracheophyta family Selaginellaceae, Selaginellaceae - lesser club mosses: terrestrial chiefly tropical plants resembling mosses |