These are lichens. Lichens are non-destructive, living organisms composed of a fungus and algae living in a symbiotic ...

Vintage Clip Art and Illustrations | Oak Tree "Old engraving of an oak tree, isolated on white. Scanned at 600 DPI with very high resolution. Published in Systematischer Bilder-Atlas zum Conversations ...

First noticed in Ohio in 2012 and in Massachusetts in 2020 in Plymouth and Bristol counties, beech leaf disease had been ...

Trees looking a bit brown in places? It's probably the 17-year cicadas laying eggs. What you need to know about flagging, and ...