I found the blacks in a spot I only found yellows at last year. I was little earlier this year, I either missed them last year or it was too dry. The trees around were hickory tulip and some soft maple. For being in a patch they didn’t seem to be associated with any perticular tree. 20-30 feet from a dead elm that produces yellows. Again I don’t think they were associated with a perticular tree. My advice to find a patch like this is to cover ground, look in the distance, couldn’t miss the black cone shape on the lighter colored leaf litter. Yellows blend in better, I say that but then I thought every black speck in the woods was a shroom, very congregated to one area though. I’ll take a pic of habitat when I go back for the yellows.