Permineralized infructescences are described from the Cerro del Pueblo Formation, Coahuila, Mexico. Morphological and anatomical observations of 584 infructescences support the identification and reconstruction of an infructescence, with fruit developed as nutlets. The fruit are each surrounded by bracts, and have a persistent style and stigma. They comprise a woody exocarp composed of macrosclereids, and mesocarp and endocarp with layers of brachysclereids. The seeds are fusiform with a thin seed coat. Seeds contain a distal hollow chamber, probably involved in dispersal, and an embryo with two cotyledons with probable helobial endosperm. The fruit and seed characters of the fossil do not correspond with an extant genus or family, thus, a new genus and species is proposed, Patocarpus coahuilensis gen. et sp. nov. Cevallos-Ferriz and Vázquez-Rueda, and is interpreted to be an extinct member of Proteales. Mots-clés : infructescence, Campanien-Maastrichtien, formation du Cerro del Pueblo, Coahuila, anatomie du fruit.

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