#acorn_cup__acorncup__cupule  cup-shaped structure of hardened bracts at the base of an acorn
  supertype:  cup.plant_organ  cup-shaped plant organ
  part of:  acorn  fruit of the oak tree: a smooth thin-walled nut in a woody cup-shaped base
     part of:  oak_tree__oaktree__oak  a deciduous tree of the genus Quercus; has acorns and lobed leaves; "great oaks grow from little acorns"

No statement uses or specializes acorn_cup; click here to add one.