Palynology of Middle Tertiary lacustrine deposits

194 K. TAKAHASHI & U. lux
Width / length ratio: 0.73-0.79.
Holotype: PI. 2, fig. 3; 80 X 59 pm in size; spore walliaevigate, two-layered, 3 pm
thick (ectexine 2.5 pm thick and endexine 0.5 pm thick); width! length ratio: 0.737;
no. of sample: Jos I - I (GN 5321).
Name derivation: Mter the Jos Plateau.
Remarks: The present monolete spores are rather large and characterized by the
psilate wall of Laevigatosporites. They are similar to the Miocene species,
Lavigatosporites gigantiformis Takahashi (1961, p. 289, Taf. 16, Fig. 3; 73.6-90.7
pm in size) from the Yunoki Formation of the Sasebo Group (Nagasaki, Japan) as
well as the Middle Eocene species, Lavigatosporitespseudodiscordatus Krutzsch 0959, p.
196, Taf. 39, Fig. 432; 50-80 pm in size), from the Geiseltal (GDR) , but concerning
the thickness of the spore wall they differ from both of them.
Botanical affinity: Polypodiaceae.
Laevigatosporites discordatus Pflug
PI. 2, fig. 6.
1953 Laevigatosporites discordatus Pflug, Thomson & Pflug, Pa1aeontographica, B, 94, p.
59, Taf. 3, Fig. 39-44.
1957 Laevigatosporites discordatus Thomson & Pflug, Rouse, Canad. Jour. Bot., vol. 35,
no. 349, p. 364, pI. II, Figs. 21 and 22.
1962 Laevigatosporites discordatus Thomson & Pflug, Rouse, Micropa1eont., vol, 8, no.
2, p. 198, pI. 2, fig. 3.
1966 Laevigatosporites discordatus Pflug, Srivastava, Pollen et Spores, vol. 8, no. 3, p.
514, pI. III, Fig. 17; pI. IV, Fig. 1.
1967 Laevigatosporites discordatus Pf. 1953, Krutzsch, Atlas, Lfg. IV und V, p. 152,
154, Taf. 54, Fig. 8 - 9 .
1973 Laevigatosporites discordatus Pf. 1953, Kedves, Studia BioI. Hung., 12, p. 62, pI.
XXI, Fig. 1 - 2 .
1985 Laevigatosporites discordatus Pflug 1953, Nagy, GeoI. Hung., Fasc. 47, p. 113, pI.
XLVI, Fig. 1 - 2.
1986 Laevigatosporites discordatus Pflug, Takahashi & Jux, Bull. Fac. Liberal Arts,
Nagasaki Univ., Nat. Sci., vol. 26, no. 2, p. 65, without figure.
Diagnostic characters: In polar view the monolete spore has an oval appearance. The
wall is psilate, two-layered and 2.5 pm thick; endexospore thin. A short dehiscence
mark extends straight and is framed by distinct lips.
Measurements: 75 pm in length and 60 pm in width.
Width / length ratio: 0.8.
Stratigraphical range: Paleocene to Miocene in Middle Europe and Late Cretaceous