Friday, December 7, 2012

White Spots on Trees #3: Common vs. Glossy Buckthorn

Glossy Buckthorn, Rhamnus frangula on the left, and Common Buckthorn, R. cathartica on the right.  Both are non-native, invasive shrubs.  And both feature white spotting to one degree or another on their bark.  The smaller dots on the Glossy Buckthorn are lenticels, openings in the bark that allow for the exchange of gases.  It's a good way to distinguish these similar looking shrubs.

I'm guessing the bigger splotches are some kind of fungus or lichen.  I've spent some time in the past trying to identify white splotches on trees and shrubs, but with only limited success.  The damp conditions that day really brought them out visually, as well as all the other fungi, algae, and lichens presented below for your enjoyment.