lichenous

adjective3

1. •
   Covered in lichen.

   • We made a few gargantuan strides, leapt three or four times more, and sat down at last in a lichenous hollow. — 1900
2. •
   Resembling lichen.

   • The mouth becomes the seat of a parasitic stomatitis; the skin is harsh and dry; small boils or a lichenous rash make their appearance. — 1907
3. •
   Composed of lichen.

   • The tree sloths of the South American forests are among the oddest of mammalian types. They are small nocturnal forms with a lichenous growth which often gives a greenish tinge to their gray hair. — 1933