Cordaites tenuistriatus

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 tenuistriatus Grand’Eury, 1877

( Fig. 9C )

In this leaf the lamina is thin and of variable thickness: 0.2 mm between veins to 0.4 mm at the level of veins due to the presence of triangular hypodermal sclerotic strands above and below the bundle sheath. This results in a typical superficial ribbing characteristic of the species C. tenuistriatus as illustrated by Renault (1879) from the Pennsylvanian of Grand-Croix. The interval between veins is less than 0.6 mm, i.e. about 17 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-