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DescriptionPrasiola stipitata is a small, dark green, wedge-shaped to oval algae, which grows up to 1 cm long. It has a flat membrane, narrowing to the distinct stem-like structure (stipe) half as long as length of the frond. The margins of the frond are curled.The most common of the Prasiola species although records of it may include other Prasiola species with which it has been confused (Hardy & Guiry, 2003). The cellular structure of the stipe and blade or the thallus is requires to discriminate between species (see Burrows, 1991 for details).
Its abundance in maximal in winter. In the south of Britain and as far north as the Orkneys, it disappears in summer. But further north Prasiola stipitata persists through the whole year (Burrows, 1991).