Uvaesporites sp.

Uvaesporites sp. B, Legrand, Palynologie des dépôts Jurassique supérieur et Crétacé inférieur du Japon, et provinces paléofloristiques du sud-est asiatique: 141, pl. IV, fig. 4 (2009).

OCCURRENCE. — Ashikajima Fm.

DESCRIPTION

Trilete microspore. Amb circular. The laesurae are thin, straight, slightly raised, and extend to the cingulum.Proximal face psilate.The equator is ornamented by verrucae joined at their base (3-4 µm high and 3-7 µm in basal diameter). The distal face is covered by verrucae of various sizes, bigger near the equator than at the pole, often joined, making irregular and very small closed spaces. Equatorial diameter = 28 µm; width of the «cingulum» = 3-4 µm.

BOTANICAL AFFINITIES

Cyatheales (Cyatheaceae) or Lycopsida ( Selaginellaceae) (Takahashi 1988).