lobule

lobe +‎ -ule

• IPA^(key): /ˈlɒb.juːl/

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[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 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.

• boulle