Usnea Cartilage Lichen

Ramalina usnea is a species of corticolous (bark-dwelling), fruticose lichen in the family Ramalinaceae. It grows on tree bark across the Americas and parts of East Africa. Growing up to 30 cm (12 in) long, it forms pale greenish-grey branching strands that darken when dry. The species is highly adaptable: it forms coarse, flattened branches in foggy environments and develops finer, more delicate forms in humid coastal areas. First described by Carl Linnaeus in 1767, it underwent a...