exostome definition

  • noun:
    • The small aperture or foramen in outer coating for the ovule of a plant.
    • the little aperture or foremen into the external coating of the ovule of a plant.
    • In botany: The aperture through the outer integument of an ovule which, with the endostome, finishes the foramen.
    • The external peristome of mosses.
    • the little aperture or foramen within the exterior layer associated with the ovule of a plant.
    • the tiny aperture or foremen within the external coating of ovule of a plant.
    • In botany: The aperture through exterior integument of an ovule which, together with the endostome, finishes the foramen.
    • The outer peristome of mosses.
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