Retitriletes sp.

(Fig. 8 A-C)

OCCURRENCE. — Kimigahama Fm.

DESCRIPTION

Trilete microspore. Amb rounded triangular. The laesurae are straight, slightly raised, and extend to the ⅔ of the spore radius. The contact area is psilate, followed by a reticulum with polygonal lumina of various shapes and sizes (3-8 µm in diameter; muri about 2 µm high) near the equator and on the distal face. The exine is about 2.5 µm thick. Equatorial diameter = 40-45 µm.

BOTANICAL AFFINITIES

Döring et al.in Krutzsch(1963) suggested an affinity of Retitriletes with spores produced by the Lycopsida ( Lycopodiaceae), for example Lycopodium Linnaeus.