#tussock__tuft  a bunch of hair or feathers or growing grass
  supertype:  #clump__bunch__clustering  a grouping of a number of similar things; "a bunch of trees"; "a cluster of admirers"
  subtype:  #wisp  a small tuft or lock; "wisps of hair"
  subtype:  #witches'_broom__witch_broom__witchbroom__hexenbesen__staghead  an abnormal tufted growth of small branches on a tree or shrub caused by fungi or insects or other physiological disturbance

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