Palynology of Middle Tertiary lacustrine deposits

246 K. TAKAHASHI & U. lux
n. comb. from the Early Eocene of Urkut, Hungary, but differs in its smaller size
and intrabaculate exine.
Botanical affinity: Unknown (Dicotyledonopsida).
Rhoipites sp. c
PI. 31, fig. 2.
Description: Tricolporate pollen grain. Figura ellipsoidal or prolate with hemispherical
pole cap in equatorial view. The three distinct colpi are symmetrically arranged and
furnished with large, rounded pores. Exine finely reticulate; lumina 0.5- I pm in
diameter; structure intrabaculate, I pm thick.
Measurements: 37 X 27 pm in size.
Width / length ratio: 0.73.
Remarks: Rhoipites sp. b (pI. 31, fig. 1) from Jos, Nigeria, is somewhat alike the
difference in shape of both in pollen grain and pores.
Botanical affinity: Unknown (Dicotyledonopsida).
Rhoipites sp. d
PI. 31, figs.
3 a-b.
Description: Tricolporate pollen grain. Figura broad-ellipsoidal or subprolate In
equatorial view. Three conspicuous colpi with lalongate pores are symmetrically
placed. Exine 1. 7 pm thick, reticulate; endexine smooth.
Measurements: 27 X 23 pm in size.
Width /length ratio: 0.85.
Remarks: A single specimen was encountered, which could not be identified
specifically.
Botanical affinity: Unknown (Dicotyledonopsida).
Rhoipites sp. e
PI. 29, fig. lOa.
Description: Tricolporate pollen of spheroidal shape in equatorial view. The three feeble
colpi are orderly placed and furnished with somewhat elongated pores meridionally.
Sculpture finely reticulate; lumina ca. 2 pm in diameter; tectate, 1. 2 pm high.
Measurements: 18 X 17 pm in size.
Width /length ratio: 0.94.