Morphotype A

Moreau, Jean-David & Néraudeau, Didier, 2023, Amber and plants from the Upper Cretaceous of La Gripperie-Saint-Symphorien (Charente-Maritime, Western France), Comptes Rendus Palevol 22 (20), pp. 455-466 : 461

Morphotype A

( Fig. 4 E-I)

MATERIAL. — One specimen: IGR-23256 .

DESCRIPTION

The specimen consists of a single fragment of a simple and quite narrow leave ( Fig. 4E, F). Only the base of the leave is preserved. The specimen is 3.7 mm long and 2.5 mm wide. The lamina has entire margins. The primary venation is pinnate ( Fig. 4E, F). The primary vein is straight. The secondary venation is brochidodromous, merging into intramarginal veins ( Fig. 4E, F). They have an opposite arrangement, forming an angle of 30 to 40° angle with the primary vein. The tertiary venation is percurrent and composed of straight to sinuous veins forming a nearly right angle with the secondary veins ( Fig. 4E, F). Ordinary epidermal cells are mainly tetragonal, hexagonal and square ( Fig. 4G, H). They measure up to 49 µm long and up to 31 µm wide. They form lines of cells on the marginal band. The anticlinal walls of ordinary epidermal cells are straight to slightly curved. Leave is hypostomatic ( Fig. 4G, H). Stomata are randomly oriented, scattered and paracytic (mainly brachyparacytic; Fig. 4H, I). The stomatal apparatuses are up to 56 µm long and up to 49 µm wide. The stomatal pits show an elliptic shape.

REMARKS

The specimen is preserved as cuticle. Many characters of this leave being unknown, we cannot reasonably propose a determination.