Give a brief account of prothallus ??
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The prothallus develops from a germinating spore. It is a short-lived and inconspicuous heart-shaped structure typically 2–5 millimeters wide, with a number of rhizoids (root-like hairs) growing underneath, and the sex organs: archegonium (female) and antheridium (male). Appearance varies quite a lot between species.
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prothallium or prothallus is typically the gametophyte stage within the life cycle. The prothallus develops from a germinating spore.
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