Gnetaceaepollenites sp.

(Fig. 13L)

Gnetaceaepollenites sp. B, Legrand, Palynologie des dépôts Jurassique supérieur et Crétacé inférieur du Japon, et

provinces paléofloristiques du sud-est asiatique: 191, pl. XX, fig. 15 (2009).

OCCURRENCE. — Ashikajima Fm.

DESCRIPTION

Polyplicate pollen grain. Amb ellipsoidal. The exine is constituted of about 15 ribs running through the grain, and describing a senestral “helix” of 180°. The ribs are 1.8-3 µm wide, separated by furrows less than 0.5 µm wide.The ends of the ribs closely gather at each end of the long axis of the grain without joining. Length = 38 µm; width = 27 µm.

BOTANICAL AFFINITIES

Gymnosperms, Gnetales.