Fungus Redux

Here's a close-up of the green-stained fungus I posted a photo of on February 20.  See all those little trumpet-shaped things growing on the fungus?  I wonder if they're some kind of  lichen.  So the food chain continues:  fungus feeding on tree, algae feeding on fungus, lichen fed by both of them.  I wonder what eats the lichen?  Probably something too small for me to see.