Lichens survive in a very wide range of habitats worldwide. Amazingly, more than 400 species can be found in Maryland.

There are thousands of species of lichens that grow in many different forms. Some are flat and crusty, some have leaflike structures that protrude outward and some have hairy filaments. While most ...

When we see strange-looking growths on our trees, our first instinct is to panic. Is there something wrong? Is it a disease?

Gardeners and homeowners often contact our Horticulture Hotline at Cornell Cooperative Extension in Oriskany when they notice a grayish blue-green crusty or mossy looking growth on trees, shrubs, ...

The lichen themselves will not cause decline, but they may be a good indicator of the overall health of your tree. An abundance lichen presence concentrated on damaged or dead wood, as your sample ...

I answer a lot of questions from home gardeners on our Garden Hotline. Quite a few questions deal with lichens. The resident asks, “Are they killing my tree?” Lichens (pronounced lie-kenz) have been ...