Operculum (botany)

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• A flap of the sporangium
  Sporangium
  
  A sporangium is a plant or fungus structure producing and containing spores. Sporangia occur in Flowering plant, gymnosperms, ferns, fern allies, bryophytes, Algaee, and Fungus....
   of a moss
  Moss
  
  Mosses are small, soft plants that are typically 1?10 cm tall, though some species are much larger. They commonly grow close together in clumps or mats in damp or shady locations....
  , covering the peristome (appendages surrounding the mouth of a moss capsule).
• The cap of the ascus
  Ascus
  
  An ascus is the sexual spore-bearing cell produced in Ascomycota fungi. On average, asci normally contain 8 ascospores, produced by a meiosis cell division followed, in most species, by a mitosis cell division....
   in certain ascomycetous
  Ascomycota
  
  The Ascomycota are a Phylum of the kingdom Fungi, and subkingdom Dikarya, whose members are commonly known as the Sac Fungi. They are the largest phylum of Fungi, with over 30,000 species....
   fungi.
• The bud cap covering the flowers of Eucalyptus
  Eucalyptus
  
  Eucalyptus is a diverse genus of Flowering plant trees in the Myrtus family, Myrtaceae. Members of the genus dominate the tree flora of Australia....
   and Corymbia
  Corymbia
  
  Corymbia is a genus of about 113 species of tree that were classified as Eucalyptus species until the mid-1990s. It includes the bloodwoods, ghost gums, spotted gums amongst others....
   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
  Pitcher plant
  
  Pitcher plants are carnivorous plants whose prey-trapping mechanism features a deep cavity filled with liquid known as a pitfall trap. It has been widely assumed that the various sorts of pitfall trap evolved from rolled leaves, with natural selection pressure favouring more deeply cupped leaves over evolutionary time....
   from accumulating rainwater.

See also

• Operculum
  Operculum
  
  In biology, operculum has been used to describe several different anatomical features, in animals, in humans and even in plants. The following list gives some of the uses of the term:...