Melanohalea davidii

Melanohalea davidii is a species of foliose lichen in the family Parmeliaceae. It was described as a new species in 2016 and named in honour of lichenologist David Leslie Hawksworth. Though morphologically similar to Melanohalea exasperata, genetic analysis has established it as a distinct species, with DNA sequence data revealing fixed differences between the two taxa. The lichen is known from only two mid-elevation sites in Spain, where it grows as an epiphyte on oak and pine trees. Its restricted distribution suggests it may represent a relict species associated with Pleistocene glacial refugia in the Iberian Peninsula....read more on Wikipedia.