Cordaites cf. crassus Renault, 1879

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

Cordaites cf. crassus Renault, 1879 ( Fig. 9B [CC]; 9D)

In contrast, this leaf found associated with the previous one, shows a very thick (up to 1 mm) lamina and a superficial surface smooth. Sclerotic strands do not extend to the bundle sheath and intermediate strands occur between veins as illustrated by Renault (1879) for specimens from Grand-Croix and by Harms & Leisman (1961) from American Pennsylvanian coal balls. The interval between veins is about 0.7 mm, i.e. about 14 veins per cm.

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-