Eotrigonobalanus furcinervis (ROSSMÄSSLER) WALTHER et KVAČEK

Kvaček, Zlatko & Teodoridis, Vasilis, 2011, The Late Eocene Flora Of Kučlín Near Bílina In North Bohemia Revisited, Acta Musei Nationalis Pragae Series B 67 (3 - 4), pp. 83-144 : 98

Eotrigonobalanus furcinervis (ROSSMÄSSLER) WALTHER et KVAČEK

Pl. 7, figs 8-10, pl. 18, figs 2-3

2002a Eotrigonobalanus furcinervis (ROSSMÄSSLER) WALTHER et KVAČEK ; Kvaček, p. 223, pl. 2, fig. 4.

(For more detailed synonymy see Kvaček and Walther 1989 and Knobloch et al.1996)

Leaves simple, lamina ovate, up to 160 mm long and 84 mm wide, margin shallowly to coarsely dentate, rarely entire, venation semicraspedodromous (to camptodromous in the entire parts), midrib strong, straight, running directly to the apex region, apex not always fully preserved, secondaries in ten to more pairs, slightly bent, at an angle of 40–50°, in marginal region ending in loops which are connected with the next apical secondary, mostly one intersecondary between successive secondaries, tertiaries percurrent, almost at a right angle to the secondaries, higher order of venation not well preserved.

D i s c u s s i o n: Leaves of this extinct fagaceous element are common in the Late Eocene fluviatile sandstones of the Staré Sedlo Fm. and other sites of this kind in Germany, Ukraine and elsewhere in Europe ( Kvaček and Walther 1989) but quite rare in volcanic facies. Several leaves have been recovered at Kučlín, of which some of enormous size (pl. 18, figs 2-3). Entire-margined E. furcinervis ssp. flagelliformis (ROSSM.) E. KNOBLOCH et. KVAČEK occur quite rarely. This tree preferred oligotrophic acidic soils of peat-forming basins but occurred scarcely in mesophytic volcanic assemblages.

M a t e r i a l: NMG 8629, G 8630, KUC 1.