Palynology of Middle Tertiary lacustrine deposits

240 K. TAKAHASHI & U. lux
Diagnosis: Tricolporate, brevicolpate pollen of triangular contour but rounded corners
and straight or slightly concave sides in polar view. Three short, costate colpi
(20 pm long) ectexinous, slightly protruding; costae 2 pm wide. The three rounded
equatorial pores are placed in the middle of the sides. Wall two-layered, reticulate
(reti-pilate); meshes are wider near to the colpi and in the central region of the
pollen grain. Lumina of the reticulum 2 - 5 pm in the central region. The
sculpture of the colpi is composed of punctae ( 1 pm) on the sides of intrabaculate
(or tectate) baculae and pilate ( 1 - 2 pm) on the apocolpia ( 1 -1.5 pm) .
Measurements: 54 - 57 pm X 54 - 55 pm in equatorial diameters.
Holotype: PI. 19, figs. 2 a - b; 55 X 57 pm in equatorial diameters; coarsely reticulate
in the central region, 2 - 5 pm in diameter; finely reticulate to punctate, 1
+ pm in diameter; muri on the sides baculate, 2 pm long; structure on apocolpia intrabaculate
(or tectate), 1 - 1. 5 pm thick; no. of specimen: Jos 1 - 6 (GN 5326).
Derivation of name: From the continent Africa.
Remarks: The new species is somewhat alike to B. annae (v. d. Hammen)
Leidelmeyer from the Paleocene of the Caribbean area, B. bombaxoides Couper from
the Oligocene to Miocene of New Zealand, B. (ai. Tiliaepollenites) reticulatus (J. J.
Groot & C. R. Groot) Srivastava from the Paleocene of Maryland and from the
Paleocene Oak Hill Member of the Naheola Formation of Alabama as well as the
pollen of recent Bombax ceiba Linnaeus.
Botanical affinity: Bombacaceae, Bombax.
Genus Brevitricolpites Gonzalez Guzman 1967.
Type species: Brevitricolpites variabilis Gonzalez Gezman 1967.
? Brevitricolpites sp.
PI. 21, figs. lOa-b.
Description: Tricolporate pollen of circular contour in approximately polar view. The
three straight colpi are very short (9 pm long) and symmetrically placed to each
other; pores (costa pori) equatoriallyelongated, 10 pm long, 2 pm wide. Exine twolayered,
1. 5 pm thick, delicately punctate; ectexine as thick as endexine.
Measurements: 30 pm in nearly equatorial diameter.
Remarks: The single specimen, although exhibiting all characteristic features of the
genus (short colpi, lalongate costa pori), could not be identified specifically.
Botanical affinity: Rutaceae.