Lichens are weird!

I didn't know this (or perhaps forgot it): "every lichen species is actually composed of two, possibly even three,  distinct species of  organisms".  See http://www.backyardnature.net/lichens.htm for details.  This picture was taken of a split cedar shingle roof on an old barn and while there are probably many different lichens present, you can readily identify the British Soldier Lichen (the guys with the red hats).