Roccellinastrum flavescens

Roccellinastrum flavescens is a rare species of fruticose lichen in the family Pilocarpaceae. It is found only in the Walls of Jerusalem National Park in Tasmania, Australia. This pale yellow, shrub-like lichen grows exclusively on the twigs of pencil pine (Athrotaxis cupressoides), a rare Tasmanian conifer. Described by Australian scientist Gintaras Kantvilas in 1990, it can be distinguished from related lichens by its unique chemistry, including traces of usnic acid, and its cottony texture that forms patches up to 1 centimetre across. The species is threatened by the vulnerability of its host tree to bushfire and was listed as endangered under Tasmanian law in 2005....read more on Wikipedia.