If your culture starts out green, and then turns to a dark charcoal, it is very likely to be Phialocephala
If your culture is green with uniformly dense, low growth in the center and taller growth towards the edges, with a white or beige margin, it might be Mollisia
If your culture is deeply furrowed, with practically no aerial growth, with patches of light grey and reddish-brown, it could be a species of Hymenoscyphus
If your culture is light grey with large clear droplets of exudate discoloring spots on the colony black, it might be Leptodontidium