Parmotrema praesorediosum

This is the most common species of the genus in our area. Most Parmotremas have contorted lobe margins that are frequently erect and give a ruffled appearance. For this reason the genus is referred to as "ruffle lichens". Apothecia are not normally produced by this species. Notice the soredia (powdery appearing substance) that is being produced on the margin edges in the right hand photo.