Page:The Journal of Indian Botany.djvu/780

272 THE JOURNAL OF INDIAN BOTANY. isolated sub-epiderinal girders on the upper side. Assimilatory tissue of arcs of palisade cells on the outer side of smaller vascular bundles and chlorenchyrnatous between them. Mechanical tissue farming a stereome tube supplemented by isolated sub-epidermal girders and I-girders. Webs formed by strips of stereome bundles. Smaller vascular bundles with arcs of palisade cells and of sheath- cells on the leptome side and with the hadrome portion embedded in stereome tube. Larger bundles numerous in the medullary tissue. Medullary tissue formed of thin-walled cells.

Eragrostis pilosa Beauv. — Fig. 356. Grooves not deep, Margins pointed and with small stereome bundles. Hairs spiny and more numerous on the lower surface. Stomata only on the lower side. Articulation tissue confined to the plane of epidermis and formed of long horizontal strands. Palisade tissue forming arcs on sides of veins. Veins vertically transcurrent. Bundle-sheaths complete round smaller veins. Mechanical tissue in the leaf forming I-girders and in the axis forming stereome tube supplemented by isolated sub-epidermal girders. Assimilatory tissue in the axis chlorenchyrnatous. Smaller vascular bundles embedded in stereome tube. Larger bundles in the medullary tissue, few and enclosed in rings of stereome. Medullary tissue of thick-walled cells towards the periphery and of thin-walled cells towards the centre.

Desmostachya bispinata Stapf.— (Eragrostis cynosu- roides Beauv.) — Figs. 357, 358. Grooves not deep. Hair3 spiny. Stomata more numerous on the upper surface. Articulation tissue extending between two surfaces. Palisade tissue forming arcs on sides of veins. Veins with arcs of complete girders of sheath-cells. Veins vertically transcurrent. Mechanical tissue in the leaf forming I-girders and in the axis forming isolated sub-epidermal girders alter- nating with I-girders. Assimilatory tissue chlorenchyrnatous. Larger vascular bundles with arcs of stereome on the outer side. Medullary tissue of thin-walled cells.

Oropetium Thomaeum Trin — Fig. 359.— Grooves deep and alternating on two surfaces. Margins pointed and with small stereo- me bundles. Clothing hairs unicellular. Club-shaped glandular hairs on the upper surface. Stomata more numerous on lower sur- face. Articulation tissue in the upper half of mesophyll and not extensive. Bundle-sheaths horse-shoe shaped and incomplete on the lower side. Palisade tissue forming arcs on sides of veins. Veins apposed to lower epidermis and vertically transcurrent above by stereome bundles. Mechanical tissue in the leaf forming isolated sub- epidermal girders on the upper side above the veins.