Under magnification, a section through a typical foliose lichen thallus reveals four layers of interlaced fungal filaments.
en.wikipedia.org The melanic morphs were better camouflaged against the bark of trees without foliose lichen, whereas the "typica" morphs were better camouflaged against trees with lichens.
en.wikipedia.org This, the lichen's type locality, was later paved and the population presumably destroyed.
en.wikipedia.org It is tundra consisting mostly of very low-growing grasses, rushes, forbs, mosses, lichens, and liverworts.
en.wikipedia.org Reindeer lichen, like many lichens, is slow growing (35 mm per year) and may take decades to return once overgrazed, burned, trampled, or otherwise consumed.
en.wikipedia.org