If your culture starts out white, but then turns to mottled reddish brown or beige, and discolors the media, perhaps it is Pezicula
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 displays aerial growth that resembles animal hair, it might be a species of Lachnum