Gymnosporangium confusum

On living leaves attached to the tree of Crataegus monogyna.

This study corresponds to the aecial stage of the species.

Peridial cells of the aecia irregular, mostly rhomboidal, some slightly rectangular, very thick-walled, with well-defined striations, reaching up to 90 µm long.

Aeciospores globose to subglobose, yellowish-brown under the microscope, with a thick and more hyaline wall, granular internal content, inamyloid in Melzer's reagent.

Herbarium material available: JTP1981/23.