Page:The Journal of Indian Botany.djvu/690

224 THE JOURNAL OF INDIAN BOTANY. Latipes senegalensis Euntli. — Uig. 325. Deeply grooved on the upper surface. Margins pointed and with small stereome bundles. Hairs spiDy and absent on the axes. Stomata more numerous on the upper surface. Articulation tissue in the upper portion of the meso- phyll. Veins provided with horse-shoe shaped sheaths incomplete below. Veins vertically transcurrent. Mechanical tissue in the leaf in the form of I-girders. Assimilatory tissue absent in the axis. Mechanical tissue in the form of subepidermal stereome tube. Small bundles embedded in stereome tube. Large bundles few in the medullary tissue. Medullary tissue of very thick-walled cells filled with granular contents.

Elionurus Royleanus Nees.— Figs. 326, 327. Epidermal cells on the upper surface vertically elongated and papillose. Surface not grooved. Hairs unicellular, long and only on the upper surface. Margins blunt and with small stereome bundles. Epidermal cells forming articulation cells. Epidermal cells on the lower surface tabular and with angular thickenings on outer walls. Stomata only on the upper surface. Palisade cells forming complete girders round smaller veins. 'Veins provided with sheaths. Upper cells of sheaths of vertically transcurrent veins forming aqueous cells. Larger veins apposed to epidermis above and vertically transcurrent below by stereome. Mechanical tissue in the leaf in the form of isolated sub- epidermal girders on the lower side of some of the larger veins. Assimilatory tissue absent in the axis. Mechanical tissue in the axis forming a sub-epidermal stereome tube. Smaller bundles embedded in stereome tube. Larger bundles few in medullary tissue. Medullary tissue of thin-walled cells.

Elionurus hirsutUS Man.— Figs. 328, 329, 330. Deeply groov- ed on the upper surface. Lower surface furrowed below the larger veins. Margins pointed and with large stereome bundles. Hairs spiny, long and unicellular. Stomata more numerous on the lower surface. Articulation tissue extending between two surfaces near the margin and forming extensive tissue between the upper epidermis and veins towards the margin. Palisade cells forming complete girders round non-transcurrent smaller veins. Larger veins alternating with smaller ones and situated in a higher plane. Larger veins near the margin vertically transcurrent. Mechanical tissue in the leaf in the form of I-girders towards the margin, of isolated sub-epidermal girders on the lower surface and of stereome-ring iDside the sheath round non-transcurrant smaller veins. Assimilatory tissue in the axis forming a continuous ring of chlorenchyma. Smaller bundles with complete sheaths and embedded in assimilatory tissue. Of the larger bundles the peripheral ones embedded in stereome tube and inner