No, green algae do not have stomata.
Green algae are aquatic organisms that obtain carbon dioxide and release oxygen through diffusion across their cell membranes. Stomata are specialized pores primarily found in the leaves and stems of land plants, and sometimes in other plant parts. Their main function is to regulate gas exchange for photosynthesis and transpiration. Because algae are submerged in water and have a high surface area to volume ratio, they can efficiently exchange gases directly with their surrounding environment through the process of diffusion. This direct exchange eliminates the need for complex structures like stomata. Gas exchange occurs across their cell membranes, allowing carbon dioxide to enter for photosynthesis and oxygen to exit as a byproduct. The availability of water also means that regulating water loss via stomata is not a relevant concern for green algae.
