Growing on a log under some debris in an oak/bay forest.
Fungi on rotting log
This is about 3" across, and I suppose it's fungus.
Found during a bioblitz investigation as part of a Citizen Science Teacher Workshop.
Young Hemitrichia calyculata or similar species in genus
maybe Leocarpus fragilis or Phanerochaete chrysorhiza
Physarum sp. Rock Creek Park, Washington, DC, USA.