Angelica plant stem. Polarised light micrograph of a cross-section through the outer part of the stem of a wild angelica plant (Angelica sylvestris). The projections are trichomes, hair-like outgrowths from the stem's epidermis. Several vascular bundles carrying water and the products of photosynthesis appear in the bottom half of the image. Magnification: x100 when printed at 10 centimetres wide.