Palynology of Middle Tertiary lacustrine deposits

230 K. TAKAHASHI & U. lux
Description: Tricolporate pollen grain. Figura spheroidal in oblique view. Three
slender colpi, radially symmetrical but gaping, converge at the apices, all of them
furnished with a small round ora. Exine two-layered,
chagrenate, weakly intrabaculate,
0.8 pm thick.
Measurements: 15 pm in diameter in oblique view.
Remarks: The single specimen was not identifiable below generic level.
Botanical affinity: Unknown.
Genus Euphorbiacites Zaklinskaja 1965 ex Sung & Lee 1976.
Type species: Euphorbiacites wallensenensis (Pflug 1953) Sung & Lee 1976.
Euphorbiacites africanus n. sp.
PI. 26, figs. 2 - 6 .
Diagnosis: Trico1porate pollen of oval to broad-ellipsoidal or prolate to subpro1ate
shape with pointed or hemispherical apices. Three conspicuous colpi, which extend
more or less parallel in radial symmetry to the polles. Caverna deep. Large circular
pores are slightly elongated meridionally.
Exine finely punctate or delicately
rugulate in surface view, however, of tectate and beculate structure in optical section,
1 pm thick.
Measurements: 40 - 53 pm in length.
31-40 pm in width.
Width / length ratio: O. 65 - O. 8.
Holotype: PI. 26, fig. 4; 49 X 34 pm in size; pores somewhat meridionally elongated;
exine tectate and baculate, 1 (.tm thick; Width / length ratio: 0.69; no. of specimen:
Jos 1 -15 (GN 5335) .
Derivation of name: africanus - from the continent Africa.
Remarks: The new species is similar to Euphorbiacites (al. Tricolporopollenites)
wallensenensis (Pflug) Sung & Lee (Thomson & Pflug, 1953, p. 103, Taf. 13, Fig.
1 - 4) from the Middle-Late Pliocene in Wallensen (Germany), Euphorbiacites
reticulatus Li, Sung & Li (1978, pp. 33-34, pl. 10, figs. 29-31) from the Eocene­
Early Oligocene in the Yingcheng region of Hubei, China and Euphorbiacites sp.
(Takahashi, 1982, p. 316, pl. 50, fig. 31) from the Eocene Nanggulan Formation
in the Yogyakarta region, central Java, but differs from all of them because of its
smaller bacula and tecta in the sculpture of the exine.
Botanical affinity: Euphorbiaceae.
? Euphorbiacites sp.
PI. 29, figs. la-b.