Crustose lichen scientific name

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  1. The thallus of crustose lichen is flat, thin and of insignificant size.
  2. It is just a crust and grows closely attached to the rocks or barks by its entire lower surface.
  3. The surface of the thallus is divided into hexagonal areas called areolae.
  4. Examples: Graphis, Rhizocarpon, Haematomma etc.