Gymnosporangium sabinae

On living leaves attached to the tree of Pyrus communis.

This study corresponds to the aecial stage of the species.

Peridial cells of the aecia angular, large, very thick-walled with radial striations, sparsely pigmented, almost hyaline.

Large spherical spermogonia present in the samples, corresponding to the stage preceding aeciospore formation.

Aeciospores subglobose to ovoid, very thick-walled, hyaline in early developmental stages, brown under the microscope when mature, with granular internal content.