A cyst-like fruiting body in certain red algae and fungi where spores develop and are protected within a chamber.
From Greek 'kystis' (cyst) + 'karpos' (fruit), with Latin neuter singular suffix '-ium'. This botanical term names the actual structure housing reproductive cells.
In red algae, the cysticarpium is like a tiny, invisible fruit factory sealed inside the plant tissue—scientists can only see it under a microscope, but it's essential for reproduction!
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