• PLANTS OP THE INDIAN DESERT. 227
Larger veins vertically transcurrenfc. Upper and lower cells of sheaths of vertically transcurrent veins aqueous. Sheaths complete round the veins. Mechanical tissue in the leaf in the form of I-girders and of isolated sub-epidermal girders on the lower side above smaller veins. T. S. of the axis elliptical. Assimilatory tissue in the axis chlorenchymatous. Mechanical tissue in the axis forming a stereome tube supplemented by I-girders. Webs formed by unmixed small vascular bundles. Smaller vascular bundles forming webs. Larger vascular bundles in the medullary tissue, few and with arcs of stereome on the outer side. Medullary tissue of thin-walled cells.
Eleusine aristata Ehrenb.— Figs. 349, 350. Not grooved. Epidermal cells on the lower surface vertically elongated and papillose. Hairs short, unicelluler and bluntly pointed. Stomata more nume- rous on the lower surface. Articulation tissue extending between the surfaces. Palisade cells forming complete girders round smaller veins ; veins provided with complete sheaths. Larger veins vertically trans- current. Mechanical tissue forming I-girders supplemented by isolated sub-epidermal girders on the lower side below smaller veins. Assimi- latory tissue in the axis forming groups of palisade cells. Mechanical tissue in the axis in the form of a stereome tubo supplemented by iso- lated subepidermal girders alternating with I-girders. Webs formed by unmixed vascular bundles. Larger vascular bundles in the medullary tissue, few and with arcs of stereome on the outer side. Medullary tissue of thin-walled cells.
(To be continued.)
