cramp balls
plural noun
1- a European fungus which produces a shiny spherical black fruiting body on dead or dying wood, especially ash黑轮层炭壳（指一种欧洲真菌）。亦称KING ALFRED'S CAKES.
1.1
- Daldinia concentrica, family Xylariaceae, subdivision Ascomycotina.拉丁名Daldinia concentrica,炭角菌科, 子囊菌亚门。
词源
so named because it was once believed to be a charm against cramp and ague.