Species: Xanthoria spp.
Xanthomendoza is a genus of lichenized fungi in the Teloschistaceae family.
This bright orange lignicolour (has wood as its substrate) lichen with distinctive cup-shaped fruiting bodies.
This species may vary in colour depending on the light regime of the substratum, though generally they are yellow-grey or yellow-green in colour.
There is a New Zealand species called Xanthoria novozelandica.decribed by Landcare Research's site below.