Gymnosperm woods from the Melo Formation (Lower Permian), Uruguay. Part II. Stiloxylon, Polysolenoxylon and Bageopitys

Three gymnosperm woods from the Melo Formation (Lower Permian) at arroyo Se co (Rivera Department, Uruguay) are described: Stiloxylon ferrandoi gen. et sp. nov., Polysolenoxylon sp. cf. Fi whitei. (Maniero) and Bageopitys sp. These specimens have the pith and the primary and secondary xylem preserved . Stiloxylon ferrandoi shows peculiar features in the initial portion of th e secondary wood and in the pith which justify the creation of a new genus and species. The other stems show common characters of already known Palaeo zoic Gondwana woods.