Have you ever seen a crusty growth on the bark of your tree or bush and wondered what it was or if was going to kill your plant? The Texas Plant Disease Diagnostic Laboratory says, not to panic. It is ...

Once upon a time, my street used to be loaded with towering, shade-providing tall trees. It was a gorgeous tree-lined street, similar to the reputable Tree City USA award-winning streets throughout ...

A shaggy, cool-green lichen hangs from the trunk of a tree in a forest on northeastern Vancouver Island, growing on the bark ...

Answer: That orange growth is lichen, not a rust pathogen. Lichen do not harm the tree or shrub in any way. They tend to grow only on that outer bark and stay there, not growing deeper into live ...

This photo shows a lichen growing on hickory tree bark. Folks sometimes become concerned when they notice strange gray-green patches on the trunk or branches of a tree. Should the growths be removed?

Lichen grow harmlessly on tree trunks and no control is needed. In fact, presence of lichens on healthy trees should be welcomed as likely positive indicators of lower levels of air pollution and a ...

They grow on almost every plant that has bark. They don't hurt plants, but they can be an indicator that plants are not growing normally because they are stressed. Here are a couple of emails from a ...

Lichen is not a plant, but a symbiosis of two or three organisms that work together: fungi and blue-green algae (often Cyanobacteria) and yeasts. The fungus can store water for “the TEAM” and is the ...

A couple of people have recently asked if the grey moss-like growth on the limbs and twigs of their trees and shrubs is the primary source of their decline. Trees and shrubs often have this sporadic ...

The Bryologist, Vol. 107, No. 3 (Autumn, 2004), pp. 340-344 (5 pages) A comparison between lime (Tilia platyphyllos) and holly oak (Quercus ilex) as substrate trees for epiphytic lichens was carried ...