My percheron mare has been transitioning to barefoot over the past few months now. She has had a lot of lumps and bumps exfoliating along the way. I let it come out on it's own, especially since she has paper thin sole.
We had enough rain for the ground to be wet over the last two days. Today her sole exfoliated in sheets. I removed what I could with the hoof pick since it was chalky and falling off easily. I found tons of black fungus, not in veins, but completely covering in between these layers of dead sole. I scraped until I saw no more black.
I have seen veins of the black stuff before, but not where it totally covered the sole like that. You would have almost thought it was a different sole color!