In the forest floor, here and there among the lichens and mosses flourished mushrooms and strange branching clusters of fungi know as dead man's fingers. The fruiting structures of these fungi probably never lasted for more than a day or two, just long enough for them to release spores. This tiny mushroom is probably one of the smallest members of the inky cap family, It probably was clustered together with others of its kind on the bark of the algarrobo tree.
Here is a scanned image of the mushroom next to a ruler so you can see the actual size.
Hard to believe, but the price on this rare, rare specimen is fantastic (to the good).