Here's something I've never seen before-- I raced to the internet to find out that this little fungus is a very young Varnished Conk (Ganoderma Lucidum). The cap will expand into a fan or kidney shape, shelf-like several inches across, a deep red or mahogany with a shiny, varnished look. They're hard, not soft like typical mushrooms. As much as we've walked the forests, we've never seen one before--- baby or fully grown.