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The dermal layer consists of two parts. The epidermis is a one-cell thick, skinlike tissue that covers the entire plant. In woody plants, this tissue is stiffer and more corky. The epidermis secretes a waxy substance that coats the outside of the leaf, the cuticle. Tiny openings, called stomata, dot the surface of the leaf. The stomata open and close to release water and gasses from the plant.
As the spore germinates, it develops into a thin, filamentous stage called a protonema. As the protonema grows, it develops into a mature gametophyte with root-like rhizoids that anchor the plant and an erect, stem-like structure with whorls of leaf-like photosynthetic tissues.s the spore germinates, it develops into a thin, filamentous stage called a protonema. As the protonema grows, it develops into a mature gametophyte with root-like rhizoids that anchor the plant and an erect, stem-like structure with whorls of leaf-like photosynthetic tissues.