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lobule ‎(plural lobules)

  1. A small lobe; a subdivision of a lobe.
  2. (botany) In liverworts with bilobed leaves, the smaller of the two lobes, sometimes modified to form a sac.
    • 1992, Rudolf M. Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, page 4
      The Jubulaceae have a leaf whose lobule, usually transformed into a water-sac, is normally very narrowly attached to the stem and to the dorsal lobe; indeed some Frullania taxa reproduce vegetatively by dropping the dorsal lobes, but not the lobules, and Neohattoria has caducous lobules but persistent lobes.