Lichenous

We made a few gargantuan strides, leapt three or four times more, and sat down at last in a lichenous hollow.

Source: wiktionary

Green-graped upon their walls An ancient hoary vine Hath clustered their carven, lichenous stones With tendril serpentine.

Source: wiktionary

He went on foot across the wilder recesses of the park, where slimy streams of green moisture, exuding from decayed holes caused by old amputations, ran down the bark of the oaks and elms, the rind below being coated with a lichenous wash as green as emerald.

Source: wiktionary

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.

Source: wiktionary