Lichens come in many colors (yellow, red, orange, blue and grey) and a few different shapes,' says horticulture expert Scott Seargeant. 'In comparison, mosses generally grow in clumps that are ...

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 ...