Fig. 3.

Histochemical features of the B. echinolabium epichile (transverse sections).a General view showing a single layer of epidermis, a few layers of subepidermal cells with idioblasts and several collateral vascular bundles in the ground parenchyma (TBO). b Detail of transverse section (a) (square) epidermis with dense cytoplasm and enlarged nuclei stained intensively for proteins (ABB). c Detail of a (square), abaxial surface of the epichile with stoma (arrowhead, TBO). d Transverse section of the epichile tissue (PAS). e Details of d (square), abundance of starch grains in subepidermal tissue. ab abaxial surface, ad adaxial surface, e epidermis, i idioblast, is intercellular spaces, n nuclei, se subepidermal tissue, vb vascular bundle