A range of lichen greens--not yellow enough to be olive, not blue enough to be pine or viridian green…

Lichen Characteristics Used in Identification Key

Landis Arboretum

Landis Arboretum

Lichens: what they are and how to identify the different types

Getting Acquainted with Lichens - WNPS Blog - Botanical Rambles

Lichens

Lichens: what they are and how to identify the different types

Living with Lichens

Mixing Realistic Natural Green in Watercolour - Lee Angold

Lichen