This foliose lichen grows in rounded rosettes up to 3 cm in diameter. It has narrow, elongated lobes closely attached to the substrate. The upper surface is gray-brown when dry, and bright green when wet! And the lower surface is black with long, simple rhizines. It produces powdery soredia from capitate or labriform soralia on the lobe tips. It only rarely produces apothecia, which have a rhizinate margin and a brown disc. It has a green algal photobiont. P. pusilloides grows on nutrient-enriched, deciduous trees in temperate, montane valleys in North America and Europe.
When @projectdrow and I were frost-proofing the garden, this sky happened above us. The clouds still illuminated by the setting sun and a clear full moon. Unique. The garden was forgotten for a few moments.