Sclereids occupy various positions in fruits. Pyrus (pear) and Cydonia (quince) have single or clustered stone cells, or brachysclereids, scattered in the fruit flesh. In the formation of clusters in the pear, cell division occur concentrically around some earlier formed sclereids, and the new cells also become sclereids. The radiating pattern of parenchyma cells around the mature clusters of sclereids is related to this mode of development. The apple (Malus) furnishes another example endocarp of sclereids in the fruit. The endocarp enclosing the seeds consists of obliquely oriented layers of elongated sclereids. Sclereids also compose the hard shells of nut like fruits and the stony endocarp of stone fruits.