#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
  member of:  family_Fucaceae
  subtype:  fucus__fucu  any member of the genus Fucus
  subtype:  black_rockweed__blackrockweed__bladderwrack__bladder_fucus__bladderfucu__tang__Fucus_vesiculosus  common black rockweed used in preparing kelp and as manure
  subtype:  bladderwrack__Ascophyllum_nodosum  similar to and found with black rockweed

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