Beech and lichens

Far not the first year I wander on the Crimean beechen woods, but only today have realized, as it is a lot of on beeches of lichens. The trunk of a beech is covered by lichens almost in some layers. And only on the solar party(side) of a tree sometimes there are sites of a pure(clean) bark. On the shadow party(side) of one beech I managed to count 2 kinds of a white lichen, 3 kinds green, 2 kinds brown, one black and one yellow kind of a lichen.
To make all these "scientific" opening to me it was required only 3 minutes of the concentrated contemplation of a tree. In comparison with 6 years of bustle around yes nearby, it is simple anything.