sessile
Adjective

sessile (not comparable)

  1. (zoology) Permanently attached to a substrate; not free to move about.
    a sessile oyster
  2. (botany) Attached directly by the base; not having an intervening stalk; stalkless.
    • 1992, Rudolf M[athias] Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, New York, N.Y.: Columbia University Press, →ISBN, page 5:
      The sporophyte foot is also characteristic: it is very broad and more or less lenticular or disciform, as broad or broader than the calyptra stalk […] , and is sessile on the calyptra base{{...}
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