Rock Tripe LichenRock Tripe, Umbilicaria vellea, (L.) Nyl.
Habit and habitat.-On rocks in high mountains.
Vegetative organs (thallus).-Large, one-leaved, leathery and somewhat smooth, ash-coloured with a bloom above; brownish to black, and hairy, below.
Fruiting organs (apothecia)-Small, appressed, orbicular and plaited, becoming convex.
Name.-From the Latin vellus, fleece, referring to the hairy nature of the under surface.