Light micrographs of cross sections of seed pericarp stained with Toluidine Blue. A. Anatomy of the pericarp and location of an oospore (asterisk) in an oogonium. B–C. Details, oospores (asterisks) in the inner parenchymatic layer of the pericarp. D. Detail, oospore located in the parenchymatic ray of a fibrous layer of the pericarp. EP, Epidermis; HL, Cork hypodermal layer; PM, Phytomelanin layer; FL, Fibrous layer; PR, Parenchymatic ray; IPL, Inner parenchymatic layer; OS, Oospore; VB, Vascular bundle. Bars = 50 µm.