Syn. Hypoxylon multiforme. Considered a blight, often found on dead or dying trees. The very much resemble the size and shape of charcoal briquettes. The fruit body is a cushion like shape, rust-red then brown to black, some times single but it can fuse together to form larger groups up to 3cm or more across.
Found normally on birch branches or trunks, but also occasionally on other trees at any time of the year.