Characteristic of all species is the tangential arrangement of sieve tubes and parenchyma (Figs. 13 and 14), the presence of ray dilatations (Figs. 13 and 15) and the occurrence of rhaphides. Rhaphides occur in enlarged ray-parenchyma cells. Prismatic crystals occupy lateral ray cells in Parthenocissus (Fig. 16). Rectangular groups of tangentially oriented sclereids occur in Par-thenocissus tripartituts and Vitis vinifera (Fig. 14). Crystal druses and laticifers occur in the cortex of Cissus and Parthenocissus
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