Exidia nigricans is a species of fungus in the family Auriculariaceae. In the UK, it has the recommended English name of warlock's butter. It produces black, gelatinous basidiocarps and is a common, w

Annulohypoxylon, sometimes called cramp balls, is a genus of fungi in the family Xylariaceae. The 27 species in the genus have a collectively widespread distribution.