belonging to the second type. Groups of soft bast embedded in the wood cylinder. Pith formed of thin-walled cells.
Trianthema pentandra L.— Figs. 141, 142, 143. Some of the epidermal cells bladder-like and attenuated at their apices into hair-like structures. Mesophyll bifacial. Clustered crystals near the veins, in the cortex and pith. Veins provided with green bundle-sheaths. Branches angled and grooved. Sclerenchymatous pericycle not developed. Wood belonging to the second type. Pith formed of thick-walled cells.
Orygia decumbens Forsk.— Figs. 144, 145, 146, 147. Me- sophyll composed of palisade tissue on the adaxial side and of arm- palisade tissue on the abaxial side. Veins not provided with bundle- sheaths. Clustered crystals found near the veins, in cortex and in pith. Axes obscurely angled. Assimilatory tissue in the axis formed of chlorenohyma. Collenchyma developed in the angles. Pericycle forming a composite ring of stone-cells. Wood belonging to the third type. Pith formed of thin-walled cells.
MollugO hirta Thunb. — Figs. 148, 149, 150. Clothing hairs forming a dense covering of stellate hairs. Mesophyll isobilateral. Star-like bundles of acicular crystals in the mesophyll. Veins embedded and without bundle-sheaths. Assimilatory tissue formed of chlorenchyma. Clustered crystals found in the cortex and in the pith. Pericycle formed of a composite ring of atone-cells. Pith composed of thin-walled cells.
Mullugo nudicaulis Lam.— Figs. 151, 152, 153. Mesophyll bifacial. Styloids found in the spongy tissue. Veins embedded and without sheaths. Clustered crystals in the neighbourhood of the veins. Assimilatory tissue in the axis formed of chlorenchyma. Structure of wood belonging to the first type. Pith formed of thin- walled cells.
Mullugo Cerviana Ser. — Figs. 154, 155. Some of the epider- mal cells larger and with water-storing function. Mesophyll isobila- teral. Veins embedded and provided with green bundle-sheaths. Assimilatory tissue in the axis in the form of chlorenchyma. Scleren- chymatous pericycle forming a composite ring. Structure of wood belonging to the first type. Pith formed of thin-walled cells.
Gisekia pharnaceoides L. — Fig. 156. Leaves sub-fleshy. Mesophyll bifacial. Veins embedded and without bundle-sheaths. Bundles of acicular crystals found near the veins, in the cortex and in the pith. Axes angled. Sclerenchymatous pericyole forming a composite ring. Structure of wood belonging to the third type. Pith formed of thin-walled cells.
Limeum indicum Stocks.— Figs. 157, 158, 159. Some of
