During growth may common outer layers be formed. Compound starch grains are typical for oat, they are built from a large number of smaller grains. The centre can easily be hollowed out by addition of water. Radial ruptures can thus be found in microscopic images. In the sap of Euphorbia splendens can dumb-bell shaped starch grains be found.
Many plant cells contain crystalline inclusions of different chemical composition and shape.
Crystalline aggregations are called druses, bundles of needle-shaped crystals are termed raphids. Typical druse shape of dicots. Typical raphid bundle of monocots. Characteristic mineralization of a gramineaen cell. Except for very few examples are plant cells surrounded by a cellulose containing cell wall .