Palynology of Middle Tertiary lacustrine deposits

258 K. TAKAHASHI & U. lux
Measurements: 24 pm in diameter.
Remarks: The only specimen found could not be related to a known species.
Botanical affinity: Unknown.
Subutrma Triporines Naumova 1939 emend. Potonie 1960.
Genus Triatriopollenites Pflug 1953.
Type species: Triatriopollenites rurensis Pflug & Thomson 1953.
Triatriopollenites josensis n. sp.
PI. 15, figs. 23-32.
Diagnosis: Triporate pollen with circular to subcircular equatorial contour. Exine
relatively thick 0.5 - 2 pm midway between ora; 3 - 3.5 pm thick around the ora)
with tumescence and atrium but neither labrum nor vestibulum; sculpture of exine intrabaculate
or intrarugulate; endexine smooth; ectexine double as thick as endexine.
Three moderately large pores, 1. 5- 3 pm wide, 3 - 5 pm deep.
Measurements: 25 - 31 pm X 24 - 31 pm in equatorial diameter.
Holotype: PI. 15, fig. 28; 30 X 30 pm in equatorial diameter; exine 2 pm thick; ectexine
intrabaculate; endexine smooth; surface of exine punctate, coarsely punctate
around central area; no. of specimen: Jos 1 -15 (GN 5335).
Derivation of name: After the Jos Plateau.
Remarks: The new species differs from all previously described ones.
Botanical affinity: Unknown.
Triatriopollenites sp.
PI. 16, fig. 8.
Description: Triporate pollen grain. Figura subcircular in outline. Exine chagrenate,
1. 2 pm thick midway between the pores and 3 pm thick around the pores; annulus
and atrium indistinct.
Measurements: 26 pm in equatorial diameter.
Remarks: Only one specimen was found.
Botanical affinity: Unknown.
Genus Triporopollenites Pflug & Thomson 1953.
Type species: Triporopollenites coryloides Pflug 1953.
Triporopollenites subrotundus n. sp.
PI. 17, figs. 2 -10.