Meanings of collema tenax in English

On the outside the walls are overgrown with black lichen and grey moss.

The lowest branches, with their nests of black lichen, burst alight.

Marshall led a nice pitch up into this huge slanting dihedral of white rock streaked with black lichen: the Zebra.

The horses were tied to the trees and stood with heads lowered beneath gnarled boughs that seemed tangled with black lichen.

The strange black lichen enwreathing those branches now gathered round her, growing in answer to a muttering of power from her full, blood-tinted lips.