The unicellular or multicellular appendages in the roots and stems of plants are called epidermal appendages or trichomes. Different types of trichomes in plants are-
(i) Hair: Hair follicles are unicellular and devoid of cuticle and chondromes are multicellular and have cuticles. It may be branched or unbranched or stellate or stellate (Althaea -leaves). Carpus The hairs formed from the cotton seed coat are fibrous in appearance and form the cotton fibers. Monocotyledonous stems do not have chondromes. Rhizomes absorb water and mineral salts from the soil. Leaves and stem hairs reduce sensation.
(ii) Colleters: Colleters are special types of multicellular trichomes. It is filled with sticky sticky substance. Digestive glands of insectivorous plants contain colleters. Punarnabha, Lemon, Rosa and Carya plants contain colaters.
(iii) Stigma: Unicellular, long, pointed and poisonous juice-filled trichomes are called Stigma. When the stinger comes in contact with the animal, the needle tip breaks and the poisonous juice is released. Skin burns due to toxic sap. Such as Tragia involucrata, Mucuna pruriens, Laportea aestuans, Agnichutra etc.
(iv) Scale: Special hair with thin coating is called scale. It is composed of sheets of flat, multicellular and disc-like cells. It reduces the rate of respiration.