Order Lecanorales, Family Parmeliaceae, Genus Cetraria. This peculiar little lichen grows on a north-facing patch of forest behind my house. I don't even know how I found it, as I was looking for something else. Please go to Wikipedia, The Lichen Portal, and iNaturalist for more information.

Almost invisible, this odd little lichen perches among needles on the forest floor.

Cetraria is drab brown in its dry state.

When wet, however, it turns green!