I often receive calls from concerned individuals about gray, fuzzy growths appearing on plants that seem to be causing harm.

The three major types of lichens -- crustose, foliose and fruticose -- all grow on this tree branch. (Photo by MSU ...

Darcy Thomas snaps a photo of a tree branch covered with lichen during a Lichen in the Winter World walk around Apgar in Glacier National Park on Saturday, Jan. 11. (Casey Kreider/Daily Inter Lake) ...

Dawn Brennan inspects the bark of a tree covered in several different lichens during a Lichen in the Winter World walk held by the Glacier Institute around Apgar in Glacier National Park on ...

As a forester, I often get asked tree health questions, and one involves flat blotches of stuff growing on well-established ...

Purpose: The stability of a triamcinolone acetonide mouthwash and its efficacy in treating oral lichen planus are described. Results: The mouthwash had a satisfactory shelf life and was well ...

As a forester, I often get asked tree health questions, and one involves flat blotches stuff growing on well-established yard ...

The results of this preliminary study suggest that this mouthwash was a safe and effective therapy for reducing the signs and symptoms of oral lichen planus. However, the therapeutic effectiveness ...

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As winter strips deciduous trees bare, lichen becomes more visible on branches and trunks, according to the Texas A&M Forest ...