Barremian palynofloras from the Ashikajima and Kimigahama formations (Choshi Group, Outer Zone of south-west Japan) Author Legrand, Julien Author Pons, Denise Author Nishida, Harufumi Author Yamada, Toshihiro text Geodiversitas 2011 2011-03-31 33 1 87 135 http://dx.doi.org/10.5252/g2011n1a6 journal article 10.5252/g2011n1a6 31ed99a5-9135-40a2-92a4-64217d9de577 1638-9395 4597011 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.