What is "fibrillose"

Fibrillose \Fi*bril"lose\ (? or ?), a. Covered with hairlike appendages, as the under surface of some lichens; also, composed of little strings or fibers; as, fibrillose appendages.

a. 1 Covered with hair-like appendages, as the undersurface of some lichens. 2 Composed of little strings or fibres.

adj. covered with fibrils more or less evenly disposed