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apotheciumthe fruiting body of some ascomycete fungi (cup fungi) and lichens, containing asci (see ASCUS). Often lightly coloured, they can reach up to 40 cm in diameter, but are usually only a few millimetres across.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005