#sporangium__spore_case__sporecase__spore_sac__sporesac  organ containing or producing spores
  supertype:  #reproductive_structure  the parts of a plant involved in its reproduction
  subtype:  #eusporangium  a sporangium that arises from a group of epidermal cells
  subtype:  #leptosporangium  a sporangium formed from a single epidermal cell; characteristic of the Filicales or of almost all modern ferns
  subtype:  #tetrasporangium  a sporangium containing four asexual spores

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