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www.canr.msu.edu/news/liking_lichens_in_the_landscape

Foliose lichens can be found on tree or shrub bark. Their name refers to the fact that they are leaf-like. They can have ruffled, lettuce leaf-types of edges that are raised up and actively growing in the spring and fall. In the summer and winter, they appear very flat. They grow best on dry, hard surfaces and are common on older, coarser ...

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.theoaklandpress.com/lifestyles/lichen-on-trees-not-harmful-but-may...

Different kinds of lichens can be found on rocks, fence posts and trees with thick, heavy bark. They need a dry surface. But when they are found on twigs or the trunks of young trees with thin ...

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.

namyco.org/lichen_basics.php

LICHEN BASICS. Lichens are amazing organisms. They are all around us and we hardly notice them. Found on soil, tree bark, rocks and even some under water, they are actually two organisms living together (symbiosis). The major component is a fungus (mycobiont), hence they are classified as fungi — the vast majority being ascomycetes.

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.

edis.ifas.ufl.edu/ep485

All three forms occur on tree bark as well as on rocks, soil, fence posts, etc. Colors may range from white to gray, red, green, yellow, or black. The presence of some lichens is normal on many Florida trees and shrubs, but heavy lichen growth often indicates poor plant growth and decline from environmental stresses, damage, or poor management.

owlcation.com/stem/Lichens-and-People-Surprising-Interesting-and-Helpful-Uses

Answer: Lichens are attached to the outermost layer of tree bark, and don’t harm the tree. As a tree ages, its bark frequently develops more crevices, which makes the surface better for lichen attachment. This means that more lichens can grow on the bark. Another factor that helps the bark to get covered with lichens over time is that ...

extension.tennessee.edu/publications/Documents/SP660.pdf

which grow on tree bark; terricolous, which grow on soil; and saxicolous, which grow on rocks. The three morpho-logical groups are fruticose (shrubby) lichens, foliose (leafy) lichens and crustose (crusty) lichens. Lichens play very significant roles in our biological world. Lichens act as air pollution indicators. Some fruticose