Photo 6: London planetree is a favored street tree because it is relatively pest-free and highly tolerant of urban conditions. This has resulted in overplanting in some areas. Although the fungus has been reported throughout North America, Massaria has [...]

Photo 1. Canker rots typically decay the heartwood and sapwood before they kill the bark and cambium and cause cankers. Note the depressed face of the stem, and that the decay tree has reacted by forming wound wood on [...]

Billions upon billions of ash trees are dying or have been killed by emerald ash borer (EAB) in both urban and forested environments in the U.S. and Canada. (Photo 1) With time, the ash all will be returned back to [...]

The name northern tooth, Climacodon septentrionalis, a common trunk decay fungus of urban maples, is a misnomer. The decay fungus is actually widely distributed in North America east of the Rockies and is found as far south as the Gulf [...]

Armillaria mellea, this one growing on a maple in the month of September, is an autumn-fruiting mushroom. Mushrooms that appear in the spring or summer are almost always not A. mellea. All images courtesy of the author. Just like the [...]