Today's walk through Gateway Mesa was a real treat...........I was so taken by the great variety of lichens that covered the beautiful rocks............and the fir trees that had established a living spot in the cracks.
If I've go this right, lichen ( a cooperative blend of fungus and algae) produce a liquid that dissolves rock...........just enough for them to make a home. Then, over the years, as the dirt gathers in the tiny holes and the winter ice expands and makes the cracks bigger, there's enough growing material for a tree seed to germinate.
And, hey, lo and behold, we see little dwarf trees looking as if they are growing happily in their own private space :)
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