Crustose lichens on trees (v. 1.0) (for experts)

by Pat Wolseley [[email protected]]

A key to some crustose lichens on trees in England. This key supports the OPAL Air survey and was prepared with the help of the British Lichen Society



If you can tell us where your specimen was found, we can start the key with the most likely species near the top of the list.

Do you want to include information on species distribution and abundance?

Yes, give extra weight to species found near a location
chosen from a map
chosen from a list of sites

No, do not give extra weight to species based on their location
do give extra weight to all common species
treat all species equally