Common Toadskin Lichen

Also known as Toadskin Lichen, Pustulate Rock Tripe, Blistered Rock Tripe

Common toadskin lichens cling tenaciously to sheer granite and sandstone faces by a single central anchor called an umbilicus. Their blistered, warty upper surfaces shift dramatically with moisture, transforming from brittle, ashen grey in drought to pliable, vibrant olive-green after rainfall. Growing at a pace of mere millimeters per decade, these long-lived symbiotic organisms slowly dissolve rock minerals and pioneer primary soil formation.