Cycadinocarpus augustodunensis (Brongniart) Renault, 1896

Galtier, Jean, Ronchi, Ausonio & Broutin, Jean, 2011, Early Permian silicified floras from the Perdasdefogu Basin (SE Sardinia): comparison and bio-chronostratigraphic correlation with the floras of the Autun Basin (Massif central, France), Geodiversitas 33 (1), pp. 43-69 : 62

Cycadinocarpus augustodunensis (Brongniart) Renault, 1896

( Fig. 9H )

Groups of dispersed ovules of this type are found in a few specimens. They are up to 9 mm long, 6-8 mm wide in the major plane and 3-5 mm wide in the minor plane of symmetry. They conform to the description of the species Cycadinocarpus augustodunensis (Brongniart) Renault (1896) from Autun. This ovule was previously described as Cordaicarpus augustodunensis by Brongniart (1881). The generic change, from Cordaicarpus to Cycadinocarpus , proposed by Renault (1896) was supported by Bertrand (1908). This ovule is mostly characterized by the irregular sclerotesta varying greatly in thickness and appearing trabeculate in tangential sections ( Brongniart 1881: pl. III, fig. 14). Original type material of this species, kept in the Muséum national d’Histoire naturelle, Paris (MNHN), has been re-investigated by one of the authors (JG) and the non-artefactual nature of this irregular slerotesta was confirmed as well as the specific identification of the Sardinian ovules to the species of Autun.

Figures

FIG. 9. — Silicified plants from the Permian of Sardinia: A, Cordaixylon sp., transverse section of a partly decorticated small stem with a solid parenchymatous pith; on the left the closely associated rachis (P) with several xylem bundles may represent a petiole of the same plant (SAR24B4L13);B, Cordaites leaves associated with Pecopteris pinnules;the broadest leaf (CC) with interfascicular scleren-