Palynology of Middle Tertiary lacustrine deposits

264 K. TAKAHASHI & U. lux
Measurements: 22 X 18 pm in diameter.
Remarks: Only one specimen was encountered. Van der Hammen (1956) proposed
as a subgenotype Triporites (Echitriporites) argutus Van der Hammen which is the
pollen of recent Campanula rotundzfolia 1. (Campanulaceae), thereafter, however,
van Hoeken-Klinkenberg (1964) defined validly a new taxon of generic rank with
the type species, Echitriporites triangulijormis van Hoeken-Klinkenberg from the
Late Cretaceous of Nigeria.
Botanical affinity: Icacinaceae. lodes.
Subturama Polyporines Naumova 1937 emend. Potonie 1960.
Infraturma Stephanoporiti Van der Hammen 1954 emend. Potonie 1960.
Genus Tetraporopollenites Frantz 1960.
Type species: Tetraporopollenites lohsensis Frantz 1960.
Tetraporopollenites sp.
PI. 17, figs. 19a-b.
Description: Tetraporate pollen of rectangular contour with straight or slightly convex
sides. Exine thin, 1 pm thick, chagrenate, crumbled during fossilization. Four
pores are placed somewhat depressed at the corners of the pollen.
Measurements: 18 X 15 pm in diameter.
Remarks: A single specimen was observed.
Botanical affinity: Unknown.
Genus Ulmipollenites WoIff 1934.
Type species: UlmipoUenites undulosus WoIff 1934.
Ulmipollenites semiundulosus n. sp.
PI. 17, figs. 11-16.
Diagnosis: Polyporate C4 - 5) pollen of polygonal contour with rounded corners
and convex sides. Exine finely rugulate to undulate or somewhat chagrenate, 1 -1.5
pm thick. Four to five round pores are placed at the corners, one pore perhaps subequatorial.
There are no labra, atria or annuli.
Measurements: 22 - 27 pm in equatorial diameter.
Holotype: PI. 17, fig. 16; 25.5 pm in equatorial diameter; exine finely rugulate, 1.5
pm thick; four pores, one of them subequatorially placed. No. of specimen: Jos 1 -
3 CGN 5323).