lith·o·phyte /ˈlɪθəˌfaɪt/
  石生植物
  Lith·o·phyte n.  Zool. A hard, or stony, plantlike organism, as the gorgonians, corals, and corallines, esp. those gorgonians having a calcareous axis. All the lithophytes except the corallines are animals.
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  lithophyte
       n : plant that grows on rocks or stony soil and derives
           nourishment from the atmosphere [syn: lithophytic plant]