Lichen

is a mid aged green which is named after the subtle colour of the algae that ages stone so beautifully. Available in-store and online.

Amateur Naturalist: What Is A Lichen?

IUCN SSC Lichen Specialist Group

Lichen - Wikipedia

Things we love: Those lovely lichens Forest Preserve District of Will County

Acarospora socialis - Wikipedia

To think like a lichen

The Language of Lichen - GroundWork

Autumn reveals lichen presence in landscape, Lifestyles

Lichens Missouri Department of Conservation

In the Race to Live on Land, Lichens Didn't Beat Plants - The New York Times