5. A fungus(Claviceps purpurea)that infects various cereal plants and forms compact black masses of branching filaments that replace many of the grains of the host plant .

• 麦角菌一种麦角属真菌（麦角菌麦角菌属），它感染谷类作物，形成一种紧密的黑色分叉细丝状物质代替作物的谷粒