Habitat for black varies by region, but I have found them most often around very large ash trees (usually living, but now some of the dead ones, too) and living and dead elm trees. I know many people also find them around tulip poplar, but I haven't so much in central Ohio. Hunting blacks is also a very different sport than hunting yellows. They come earlier, they are smaller, and they are about 1000 times harder to see. I know experienced hunters who never find blacks in Ohio. The one good thing about blacks is that they tend to come back more consistently year after year than yellows, so if you find a patch or an area you can hunt it for a long time.