#hypobasidium  special cell constituting the base of the basidium in various fungi especially of the order Tremellales
  supertype:  #plant_organ__plantorgan  a functional and structural unit of a plant or fungus
  part of:  #basidium  a small club-shaped structure typically bearing four basidiospores at the ends of minute projections; unique to basidiomycetes

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