I believe this is Didymium columellacavum.
Sporangia gregarious, found on leaf litters/twigs. About 1-1.5mm and base of stalk is dark. Columella large, capillitium abundant, lime crystals stellate and areolae observed (without stain). Spores brown 7.7-8.0μm (7.69-8.08 μm), minutely warted and with group warts.