Tranzschelia pruni-spinosae . a, b. On Anemone ranunculoides: a. A sterile infected shoot surrounded by lower but flowering uninfected plants; b. Spermatogonia (black) and aecia with white peridia and orange spore mass on the lower leaf side; c–e. On Prunus domestica: c. Pulverulent uredinia located on chlorotic spots of the leaf; d. First telia replacing uredinia, on chlorotic spots; e. Later telia with pulverulent spore mass, not located on chlorotic spots; (b, e from Poelt and Zwetko 1997: 332).