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www.nps.gov/articles/lichens-and-air-quality.htm

Lichens are durable enough to grow on tree bark and bare rock, yet are sensitive to pollution and air quality. One species in particular was used to track levels of air-borne lead over a 100 year period!

www.torontomastergardeners.ca/askagardener/grey-lichen-like-growth-on-gingko...

Grey lichen-like growth on gingko bark and birch bark (Question) Gingko tree is planted near Lake Ontario in a fairly exposed location. It has been there for 10 years. This year, grey lichen-like, roundish growths have appeared on trunk and lower branches. None of the leaves on the lower branches have fully developed: they are tiny and not ...

www.britannica.com/science/lichen

Lichens are found worldwide and occur in a variety of environmental conditions. A diverse group of organisms, they can colonize a wide range of surfaces and are frequently found on tree bark, exposed rock, and as a part of biological soil crust. Lichens have been used by humans as food and as sources of medicine and dye.

www.ehow.com/info_12224358_preserve-lichen-moss-tree-branch.html

Lichen and moss commonly grow on tree branches, creating a green, brown or silvery coating on their bark. While a lichen- or moss-coated tree branch can be an aesthetically appealing decoration, it will deteriorate over time if you do not use a preservation method.

www2.crms.uga.edu/lichens/files/lichen_12_guide.pdf

GRAY-GREEN LICHENS ON TREES Note: Algae may grow on these lichens giving them a green appearance. Canoparmelia texana A “Texas” shield lichen Foliose lichen, gray-green, growing on tree bark (corticolous), closely attached, with dusty patches over the surface (laminal soredia). It is one of a few lichens found on loblolly pine.

www.ehow.com/info_8517996_lichen-only-one-side-tree.html

Lichens are the moss-like organisms that grow on the bark of trees. They capitalize on the warm, sunny situation that a tree trunk provides. Contrary to popular belief, lichen neither harms its host plant, nor feeds on it. It is merely a squatter looking for a nice place to stay and grow.

blog.davey.com/2018/05/what-are-these-green-spots-on-my-tree-s-trunk-or-branches

Algae, moss and lichens are the three main types of green growth that can appear on tree branches and trunks. All look similar at first glance but have a few subtle distinctions. See which your tree has below. Tree Bark “Fungus” Identification. Algae, moss and lichens aren't harmful to trees, so don't fret if you spot any of their green growth.

homeguides.sfgate.com/can-lichen-kill-live-oak-80356.html

The bark of trees such as the live oak provides a stable surface for lichen growth. Lichens may, in fact, help live oaks by discouraging insects and fungi. ... The denser the leaf canopy, the ...

people.oregonstate.edu/~mccuneb/lichenharm.htm

The native trees and the native lichens and bryophytes have the advantage of having evolved together over the past several million years, so that trees with bark that lichens can hold on to will have evolved strength enough to support them (if they weren't that strong already).

www.sciencedirect.com/science/article/pii/S0269749114000682

The cited comparisons of tree bark refer all to conifers. The literature regarding deciduous trees with respect to N concentration is rare and this shows the urgent need for research in this context. Thus, we opine that the appraisal of tree bark samples is less substantiated as for lichens and mosses.