Operculum (botany)

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In botany, operculum may be used to describe any of the following:

  • 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.
  • 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

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