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laidbackgardener.blog/2020/10/28/lichens-on-trees-not-to-worry

Benefits of Lichens Lichen on the bark of an apple tree. Photo: extension.unh.edu. Lichens are even considered beneficial. First of all, they make interesting pollution indicators, as they won’t grow in polluted air. If lichens start to grow on your trees, that’s good news: a sign that the air is fairly pure! In fact, lichens are moving ...

www.kiwicare.co.nz/advice/garden/lichen-on-trees

On trees lichens, do not cause harm to the tree, they are not parasites and do not consume any part of the tree. They are commonly found growing on the bark of older trees. Some regard the lichens as attractive additions to the tree, but others regard them as unsightly and want to remove the lichen to leave the tree bark clean.

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.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.

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.

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.

extension.umn.edu/trees-and-shrubs/non-harmful-tree-conditions

Several types of lichens growing on tree bark. Lichens are a combination of a fungus with an algae or bacterium. They can be found on any non-moving substrate like rocks or woody plants. Lichens are commonly found on the bark of trees and shrubs in Minnesota. In some cases trunks and branches may be completely covered by lichens.

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 ...

www.starnewsonline.com/article/NC/20100128/News/605049985/WM

Lichen are rarely found on healthy, fast growing trees and shrubs because they are always shedding bark, making it difficult for lichen to attach to them. If you have a tree or shrub that has ...