Palynology of Middle Tertiary lacustrine deposits

236 K. TAKAHASHI & U. lux
Intrabaculitricolporites sp. a
PI. 27, fig. 12.
Description: Tricolporate pollen of spheroidal shape in equatorial view. The three prominent
colpi converge at the apices. Equatorial pores somewhat elongated equatorially.
Exine two-layered, 2 pm thick, intrabaculate; ectexine three times as thick as
endexine.
Measurements: 39 X 36 pm in size.
Width I length ratio: O. 923.
Remarks: This specimen is similar to Intrabaculitricolporites d. quinetii Kedves (pI.
28, figs. l7a- b in this paper), but differs in its broader shape, the thinner exine
and the elongated pores.
Botanical affinity: Unknown.
Intrabaculitricolporites sp. b
PI. 28, figs.
2a-b.
Description: Tricolporate pollen of globular shape in approximately polar view.
Three rather short colpi slender, radially symmetrical, converging at the poles. Exine
two-layered, 0.5 pm thick, intrabaculate. Pores small and round.
Measureemnts: 12 X 11 pm in nearly equatorial diameter.
Remarks: The very small specimen resembles Cyrillaceaepollenites exactus (Pot.)
Pot., although the exine is intrabaculate.
Botanical affinity: Unknown.
Intrbaculitricolporites sp. c
PI. 28, figs. l8a- b.
Description: Tricolporate pollen grain. Figura ellipsoidal or prolate with pointed pole
cap in equatorial view. Three distinct colpi radially symmetrical, converging at the
poles. Equatorial pores elongated Oalongate), 5 pm long. Exine three-layered ( 1 :
2 : 1 ), 2.5 pm thick; ectexine intrabaculate.
Measurements: 32 X 21 pm in size.
Width I length ratio: 0.656.
Remarks: This specimen looks like Intrabaculitricolporites d. quinetii Kedves (pI.
28, figs. 17a - b in this paper), but differs in the three-layered exine and the
lalongate pores.
Botanical affinity: Unknown.