Syncesia madagascariensis

Syncesia madagascariensis is a rare species of crustose lichen in the family Roccellaceae. It is found in Madagascar. This lichen forms large, continuous patches up to 15 cm across on tree bark, with a creamy surface that becomes increasingly cracked with age and distinctive flattened, disc-shaped fruiting bodies that show radiating ridge patterns. It is known only from montane forests near Ambositra at 1705 metres elevation, where it grows on tree trunks in forests dominated by myrtle family trees....read more on Wikipedia.