#rockweed  coarse brown seaweed growing on rocks exposed at low tide
  supertype:  brown_algae__brownalgae  algae having the chlorophyll masked by brown and yellow pigments
  subtype:  fucus  black_rockweed  bladderwrack
  member of:  family_Fucaceae__Fucaceae  small family of brown algae: gulfweeds; rockweeds
     member of:  order_Fucales__Fucales  coextensive with the family Fucaceae
        member of:  class_Phaeophyceae__Phaeophyceae  brown algae; mostly marine and littoral eukaryotic algae
           member of:  division_Phaeophyta__Phaeophyta  coextensive with class Phaeophyceae; in some classifications subsumed in the division Heterokontophyta

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