A spore-bearing or reproductive structure found in certain red algae and fungi, particularly in the Ceramiaceae family.
From Greek 'keramos' (pottery/tile) combined with '-idium' (a diminutive suffix meaning small structure). This botanical term describes the microscopic reproductive organs of these organisms.
A ceramidium is so tiny that you'd need a microscope to see it, but inside this miniature structure are thousands of spores ready to create new red algae—it's nature's microscopic seed pod!
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