Lastreopsis Ching

Caudex creeping or suberect, its vascular system a radially symmetrical dictyostele; stipe grooved on the adaxial surface with linear aerophores along the ridges bordering the groove; scales on caudex and near base of stipe firm, narrow, consisting mainly of narrow cells, not clathrate, scales on rest of frond small and never abundant; frond in almost all species deltoid-pentagonal, the basal pinnae longest and with elongate basal basiscopic branches; lamina always much dissected, the ultimate leaflets always small and ± deeply lobed with asymmetric bases, their margins thickened and decurrent to join the margins of the groove of the pinna-rachis, the prominent costae of the distal parts of pinnae decurrent to form a raised band between the thickened margins of the groove; veins always free; hairs almost always present on both surfaces of axes and often on lamina, always consisting of several cells, in some species acute, remaining stiff when dried, in other species not acute and becoming contorted when dried; unicellular glands sometimes present, ovoid to elongate; sori orbicular, indusiate or not, the indusia in some species bearing glands like those of the lamina; sporangia lacking appendages on the body but usually bearing glands on the stalk; spores winged or with many obtuse protuberances.