Tuckermanopsis

Tuckermannopsis is a genus of lichen-forming fungi in the family Parmeliaceae. The genus contains about twelve species of foliose (leafy) to somewhat fruticose (bushy) lichens with brownish or greenish thalli. Species in Tuckermannopsis are found primarily in temperate and boreal regions of the Northern Hemisphere, with centres of diversity in western North America and East Asia. Members of the genus are distinguished by their cetrarioid growth form, with reproductive structures largely restricted to the margins of the lobes, and the absence of usnic acid in their upper cortex....read more on Wikipedia.