calyptra









calyptra


noun Botany.

  1. Also called cap. a hood or hoodlike part, as the lid of the capsule in mosses.
  2. a root cap.

noun botany

  1. a membranous hood covering the spore-bearing capsule of mosses and liverworts
  2. any hoodlike structure, such as a root cap

  1. In some bryophyte plants, a structure that covers the young sporophyte as it develops within the tissues of its gametophyte parent. The calyptra, which consists of a thickening of the archegonium walls, eventually breaks open as the spore capsule grows.
  2. See root cap.
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