Tissues that form outer coverings are called as dermal tissues. Dermal tissue (Dermis) usually consists of a single layer of tissues having variations in the types of cell based on their functions and location.
Three different types of the epidermis (outer most layer), mesodermal (The middle layer) and endodermis (the innermost layer). In desert plants, it may be even more thick and waxy. Small pores in the epidermis of the leaf, called stomata.
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