Szekessy Vilmos (szerk.): A Magyar Természettudományi Múzeum évkönyve 54. (Budapest 1962)
Rásky, K.: Tertiary plant remains from Hungary (Upper Eocene and Middle Oligocene)
Type locality: Budapest-Óbuda the former Nagybátony-Üjlak brickyard. Type stratum : marl formation, Upper Eocene. Materials : 2 leaves, holotype impression and counterpart; paratype impression and counterpart. Diagnosis : Leaves ovate-elliptical. Length 13,5 cm, width 6,5 cm. Apex terminating in short tip, base blunt. Margin of lamina dentate, locally slightly undulating. No teeth on leaf base. Teeth small, erect, rarely spaced, irregular. Midrib thick, emitting 6 — 7 pairs of raised secondary veins, at a great distance from each other. Basal secondary veins opposite, other veins alternate. Basal secondary veins originating considerably above leaf base, generally irregularly disposed. Secondary veins of a camptodrome type, but arches broken. Lower pair of secondaries bordered by arcuately connected tertiary veins. First pair of tertiaries emitted directly from midrib, on one side of lamina immediately beside secondary vein, on other side somewhat below r . These alternating tertiaries, originating from midrib and directed towards leaf margin, are very characteristical. On base of leaf and directly beside margin, still another, thinner pair of veins extending upwards, joining tertiaries above. Tertiaries, connecting secondary veins, more or less parallel and broken. Areas between tertiaries filled with fine reticulation of very small interstices. Leaves coriaceous. Remarks : HOLLICK described leaves of a similar lamina by the name Dillenia alaskana (HOLLICK, 1936, p. 153, Pt. 94, Figs. 1-2), but the number of their secondary veins are greater, their type craspedodrome, their configuration on the base of the leaf different, the dentation denser. They cannot be brought into close relationship. MACGINITIE'S leaf listed as Rhamnus plena 'from the Middle Eocene flora of the Sierra Nevada (MACGINITIE, 1941, p. 148, Pt. 38, Fig. 2), and the leaf published by BECKER as also Rhamnus plena (BECKER, 1960. p. 115, Pt. 33, Fig. 1) from the Lower Eocene Mormon Creek flora have smaller laminae, their dentation is different and the configuration of the secondary and tertiary veins on the leaf bases are not to be reconciled with the leaves from Óbuda. Fig. 1. The leaf of Sloanea sigun (BL.) SCHUM., recent for comparison, Java, X 2/3 After KOORDERS, S. H. & TH. VALETON, 1914. Comparison with recent species: the leaves of Sloaneaephyllum obudaense can best be compared to those of the recent SE Asiatic Sloanea sigun (BL.) SCHUM. Its leaves might either be entire or dentate. The midrib and the secondary veins are raised, similarly to those of the fossil remains. The secondary veins and the tertiaries, delimiting the lower pair of secondaries, are of a camptodrome type. The basal secondary veins originate high above the base of the leaf, and the first branch of the tertiaries bordering on them is emitted directly at the point of issue of the secondary veins from the midrib; they
