Yarrumia colensoi is a species of lichen. It occurs in New Zealand, but is not endemic.
This species is glaucous green, with a dimpled, wide, lobed upper surface. There are yellowish isidiate margins, and a light brown undersurface with pseudocyphellae.
It is known to grow on southern beech, podocarps, and other trees.
The species name is derived from William Colenso. The cave wÃÂtÃÂ Maotaweta virescens will feed on it in captivity.