I seem to have come across a few black fungi recently, so tried to identify them.
This one was in grassland on a cliff in Devon in the summer, 1-2 inches across. I’m not sure about this, but it could be indigo pinkgill.
This one was on a dead birch log in the autumn in Cheshire, a few centimetres across, part of a group of varying sizes. I think this is King Alfred’s Cake fungus, so named because it looks like burnt cake. Surprisingly, it can be used as tinder.
The final one is a much larger bracket fungus (6-8 inches) in Derbyshire in the autumn, on a dead beech stump. A common name is willow bracket, but it is found on other broad leaved trees. This is another fungus that was used for kindling.