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Lichens grow on all continents and have the ability to survive all altitudes and climates. In general, all lichens require time, undistributed surfaces and clean air to survive and thrive.


Lichens are symbiotic creatures that are comprised of both fungi and algae. Typically, a lichen is comprised of a fungal filament with green algae living inside of the filament. Cyanobacteria may also reside inside of the fungal filament to complete the lichen.


While the lichen plant can't cause any diseases, "lichen" is also a term that describes skin diseases such as lichen sclerosus and lichen planus, as Mayo Clinic explains. However, doctors do not know the cause of lichen diseases, but some suspect it relates to the immune system.


Several commonly planted trees have white bark, including varieties of birch, sycamore and poplar. Among these trees, however, the look of the bark and trunk and their particular shade of white can differ greatly. Thus, an inspection of both, as well as the trees' leaves, can help with identificatio


Symptoms of diseases related to lichens include itching, skin blotches, blisters, bleeding and ulcers, states Mayo Clinic. Lichen-related diseases generally manifest in skin conditions and rashes.


According to New Mexico State University, removing a complete band of tree bark from a tree can kill the tree because it contains the phloem layer that is responsible for carrying food to the roots. When the tree has no way to receive food, the roots will eventually die and stop sending water and ot


While there are several approaches to repairing missing bark from a tree, New Mexico State University recommends using bark grafting. Since this process uses thumb-sized branches from the tree, it works even when the original bark is missing. It is especially useful in repairing damage from vehicles


Healing trees with bark damage involves several actions, including physical repair, filling cavities and pruning. When wounded, trees respond in two ways: compartmentalization and development of protective zones. Regardless of how trees react to injury, however, there are several methods used to hel


Lichens may belong to one, two, or all three of the following kingdoms: Fungi, Protista and Monera. Lichens are groups of multiple organisms, which may occur in the forms of fungi, protists and monerans. Although they share the classification of lichens, species vary widely in habitat, appearance an


The cause of lichen planopilaris is unknown, states Mayo Clinic. It may be triggered by hepatitis C infections, the hepatitis B vaccine, the flu vaccine, exposure to certain pigments and chemicals, NSAIDs, and certain heart disease or blood pressure medications. It is commonly known as lichen planus