Pseudoflowers of rust fungi: a. Gymnosporangium sp. on Sorbus aucuparia; like in many other rust fungi, the bright, often circular, reddish or orange leaf spots with crowded spermatogonia serve as pseudoflowers providing nectar; b. Endophyllum euphorbiae-sylvaticae (Pucciniaceae) on Euphorbia amygdaloides, forming a greenish-yellow pseudoflower at the shoot tip; the leaves of the pseudoflower are densely covered with spermatogonia; (a by Walter Obermayer; b from Poelt and Zwetko 1997: 328).