Palynology of Middle Tertiary lacustrine deposits

Palynology of Middle Tertiary lacustrine deposits 245
1985 Retitricolporites rugatus Kedves. Acta BioI.. Nova Ser., Tom. XXXI, Fas. 1 - 4.
pp. 106, 108, pI. V. figs. 59, 60.
Diagnosis: Tricolporate pollen. of subprolate to spheroidal shape in equatorial view.
Three prominent colpi with lalongate pores converge symmetrically at the apices.
Exine finely reticulate; muri or tectatum 0.7- 1 pm high; lumina of reticulum 1 -
2 pm in diameter.
Measurements: 33-40 pm X 30-32 pm in size.
Width / length ratio: 0.8-0.9.
Previous record: Southeast Asia (Tertiary).
Viet Nam: Tertiary.
Remarks: The specimens resemble Rhoipites (al. Retitricolporites) rugatus Kedves
and may refer to it.
Botanical affinity: Dicotyledonopsida.
Rhoipites sp. a
PI. 30, figs. 2 - 3 .
Description: Tricolporate pollen of spheroidal shape in equatorial view. Three conspicuous
and broad colpi with rounded (?) and large pores, radially symmetrical, converge
at the poles. Exine coarsely reticulate; muri baculate, 2.4- 4 pm long; lumina
of reticulum 1 - 5 pm in diameter.
Meaurements: 35-50 pm X 32-45 pm in size.
Width I length ratio: 0.9
Remarks: The specimens are similar to Rhoipites· Cal. Retitricolporites) pflugi Kedves
n. comb. from the Early Eocene of Urkut, Hungary, but contrast with broader colpi
and longer muri.
Botanical affinity: Unknown (Dicotyledonopsida).
Rhoipites sp. b
PI. 31, fig. 1.
Description: Tricolporate pollen grain. Figura ellipsoidal or prolate in equatorial sight. Three
narrow colpi conspicuous, orderly placed, with lalongate pores. Exine very finely
reticulate; lumina 0.5- 1 ,urn in diameter; structure intrabaculate, 1. 5 ,urn thick.
Measurements: 40 X 27 ,urn in size.
Width / length ratio: 0.675.
Remarks: The specimen resembles Rhoipites Cal. Retitricolporites) manumi Kedves