This fungus has a host of common names in addition to Black Bulgar ---- eg., Popes Buttons. It seems to have interesting chemical properties. An alcoholic extract has been shown to affect histamine ---- so stops itching in mice (antipruritic and antierythematous effect). The fungus also has the chemicals bulgariclactane -A and -B which kill nematodes. A water soluble polysaccharide has anti-malarial activity in malaria-bearing mice. All usefull stuff!
Although considered a delicacy in parts of China it is best avoided due to reports of unpleasant effects --- poisoning.