Growing on trunk of young Abies balsamea in dense spruce/fir forest. ID based on green sorediate thallus lacking apothecia and white webby prothallus.
Growing on exposed siliceous boulder at edge of lake. ID based on abundant apothecia and lack of soredia.
Growing on exposed siliceous boulder at edge of lake. ID based on smooth brownish surface lacking apothecia with lower surface a velvety mat.