Explain sclereids with their types.

Explanation

1. Branchysclereids or Stone cells : Isodimetric sclereids with cells wall. It is found in bark, pith cortex, hard endosperm and fleshy portion of some fruits Example : - Pulp of Pyrus.
2. Macrosclereids : Elongated and rod shaped cells, found in the outer seed coat of leguminous plants. Example : Crotalaria and Pisum sativum.
3. Osteosclereids (Bone cells) : Rod shaped with dilated ends. They occur in leaves and seed coats. Example : seed coat of Pisum and Hakea.
4. Astrosclereids : Star cells with lobes or arms diverging form a central body. They occur in petioles and leaves. Example : Tea, ymphae and Trochdendron.
5. Trichsclereids : Hair like thin walled sclereids. Numerous small angular crystals are embedded in the wall of these sclereids, present in stems and leaves of hydrophytes
Example : Filiform Sclereids : The sclereids are present in the lamina of Olea europaea. They are very much elongated fibre like and about 1 mm length