Plant Parasites of Europe

leafminers, galls and fungi

aecium

(pl aecia). The second stage in the life history of rust fungi, Pucciniales.

Puccinia poarum aecia

Puccinia poarum: underside of a leaf with aecia

Puccinia poarum: aeciospores

characteristically, the spores are produced in a chain

Puccinia poarum: aeciospores being squeezed out

only under exceptionally quiet circumstances a picture like this can develop