Palynology of Middle Tertiary lacustrine deposits

242 K. TAKAHASHI & U. lux
Remarks: The authors 0982, 1986) combined the species striatulus originally with
the genus Striatrieolporites v. d. Hammen 1956 ex Leidelmeyer 1966, which,
however, is invalid according to the laws of nomenclature. Accordingly the valid
genus StriatoeolPorites Ramanujam 1966 is adopted herewith.
Botanical affinity: Aceraceae CAeer) , Anacardiaceae (Rhus, Buehanania), Cucurbitaceae
(Aetinostemma, Gymnostemma) , and Gentianaceae (Crawfurdia) etc. produce
tricolporate pollen grains with striated sculptures.
StriatoeolPorites sp. a
PI. 25, fig. 8.
Description: Tricolporate pollen of elliptical shape with pointed pole cap in equatorial
view. The three slender colpi are conspicuous arid converge at the poles; the pores
are meridionally elongated. Exine finely striated, some striae are forked; muri 0.5
f-lm long.
Measurements: 39 X 24 f-lm in size.
Width I length ratio: 0.615.
Remarks: Only one specimen was observed.
Botanical affinity: Same as S. striatulus Takahashi & lux.
Striatoeolporites sp. b
PI. 25, figs. 9 a-b.
Description Tricolporate pollen grain. Figura ellipsoidal or prolate with pointed pole
cap in equatorial view. Three distinct colpi in symmetrical arrangement converge at
the poles. Exine finely striate with some forked striae, intrabaculate,
Pores round.
Measurements: 35 X 23 f-lm in size.
Width I length ratio: 0.657.
Remarks: One sp~cimen was observed only.
Botanical affinity: Aceraceae CAcer).
1 f-lm thick.
Striatocolporites sp. c
PI. 26, fig. 1.
Descripton: Tricolporate pollen with broad-elliptical or oval contour in equatorial
sight. Three slender colpi are quite conspicuous and extend symmetrically to the
poles where they converge. Exine finely striate; muri 1. 2 f-lm long. Pores equatorial-