Fig. 2. A, Transmitted light micrograph of leaf section showing enlarged epidermal cells (arrows) of the type from which trichomes will develop. These cells stain more darkly with Toluidine Blue than normal epidermal cells. B, Immature glandular trichome. Secreted material has accumulated in the sub-cuticular space (SS), but the stalk cell is still above the level of the epidermis. EC, Elevated cuticle; Ba, basal cell.