#bladder_fern__bladderfern  any fern of the genus Cystopteris characterized by a hooded indusium or bladderlike membrane covering the sori
  supertype:  #fern  any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores
  member of:  #genus_Cystopteris
  subtype:  #brittle_bladder_fern__brittlebladderfern__brittle_fern__brittlefern__fragile_fern__fragilefern__Cystopteris_fragilis  delicate fern widely distributed in North America and European having thin pinnatifid fronds with brittle stems
  subtype:  #mountain_bladder_fern__Cystopteris_montana  fern of rocky mountainous areas of hemisphere
  subtype:  #bulblet_fern__bulbletfern__bulbletbladderfern__berry_fern__berryfern__cystopterisbulbifera  North American fern often bearing bulbils on the leaflets

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