Alternaria cheiranthi Alternaria cheiranthi (Libert) Bolle, 1924 parasite Leaf spots with black caespituli. Conidia mostly solitary, 13-32 x 20-100 µm, septate in both directions. host plants polyphagous Draba; Erysimum; Spinacia. references Brandenburger (1985a: 191).