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An operculum or (in plural) opercula are botanical terms describing a certain structure or structures of certain vascular plants, mosses, or fungi which act as a cap, flap, or lid. In vascular plants, an operculum may also be called a bud cap. Examples of structures identified as opercula include: *A flap of the sporangium of a moss, covering the peristome (appendages surrounding the mouth of a moss capsule). *The cap of the ascus in certain ascomycetous fungi. *A lid covering the aperture of pollen grains. *The bud cap covering the flowers of ''Eucalyptus'' and ''Corymbia'' trees which falls off as they open. *The covering of a pyxidium (capsule whose upper part falls off when the seeds are released) of a plant, such as the plantain. *The flared leaflet that prevents a pitcher plant from accumulating rainwater. ==See also== *Operculum (disambiguation) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Operculum (botany)」の詳細全文を読む スポンサード リンク
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