Lily leaf. Light micrograph (LM) of a transverse section through the leaf (pinna) of a lily plant. Lilium (members of which are true lilies) is a genus of herbaceous flowering plants growing from bulbs, all with large prominent flowers. Lilies are a group of flowering plants which are important in culture and literature in much of the world. Present is a smallcentral vascular bundle made up of phloem sieve cells and xylem tracheids. Dicot leaves are dorsoventral as the upper and lower surfaces of the leaves are distinguished. The vascular bundle is usually large in dicot leaf whereas in monocot leaf, both small and large parallel vascular bundles are present. Magnification: x10 when printed at 10 centimetres wide.