What is the green stuff growing on my trees? - North American Tree Service

Most of the time, in damp, shady areas you will spot a substance on the branches or trunk of a seemingly declining tree. This substance can be either lichen or moss. What’s the difference between lichen and moss on trees? Lichen A combination of fungi and algae Can be a range of colors

Common Tree Species

Tree Trimming & Pruning Services

What Are These Green Spots on My Tree's Trunk or Branches?

Complete Guide to Oak Trees BBC Gardeners World Magazine

Why You Should Plant Oaks - The New York Times

Tree Health Inspection Services & Treatment

How to Grow and Care for a Tamarack Tree

Looking for American Beech

How to Grow and Care for Green Ash

Lichen, Algae, and Moss on Trees University of Maryland Extension