Algae, lichens and moss often form green or grey, powdery or mossy, crusty growths on the stems, branches and trunks of trees and shrubs. Pictured here, lichen and moss. This dreary "gray all day" ...

Understanding the Context

Seattle Times: What’s that growing on my tree? Everything you need to know about lichens, moss and algae What’s that growing on my tree? Everything you need to know about lichens, moss and algae Patios are prone to accumulating dirt, algae, moss and lichen, especially after months of cold, damp weather. Green algae is particularly common on patios and is often caused by persistent moisture, ...

Key Insights

San Antonio Express-News: Ball moss, lichen and mistletoe: Which ones will damage your trees in Texas and which are safe Ball moss, lichen and mistletoe: Which ones will damage your trees in Texas and which are safe San Antonio Express-News: Calvin Finch: Ball moss, lichen, mistletoe. Only one is a parasite What came first, the dying branches or the ball moss? A number of gardeners credit the ball moss seen on declining live oak branches as the cause of the decline. The truth is that the ball moss is on ...