Noun | 1. | Lepidodendrales - fossil arborescent plants arising during the early Devonian and conspicuous throughout the Carboniferous 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 Lepidodendraceae, Lepidodendraceae - fossil plants characterized by conspicuous spirally arranged leaf scars on the trunk |