Szekessy Vilmos (szerk.): A Magyar Természettudományi Múzeum évkönyve 54. (Budapest 1962)

Rásky, K.: Tertiary plant remains from Hungary (Upper Eocene and Middle Oligocene)

are directed towards the margin, in agreement with the venation of the fossil specimens. The recent trees are 40 m high, very frequent in the rain forests of Java. The fossil remains are also favourably comparable to the dentate leaves of the 10 m high recent Sloanea mollis GAGNEP. trees. Sloaneaephyllum hungaricum n. sp. (Plate III, Fig. 2) Derivation of specific name: after the country where it was found. Holotype: the specimen shown on Plate III, Fig. 2, and its counterpart. In the Paleobotanical Collection of the Botanical Department, Hungarian Natural History Museum, Budapest. Collect, nr. 62. 74. 1. and nr. 62. 915.1. Paratype: 1 leaf, impression and counterpart. Collect, nr. 62. 916. 1. and nr. 62. 917. 1. Type locality: Budapest-Óbuda, the former Nagybátony-Üjlak brickyard. Type stratum: marl formation, Upper Eocene. Materials: 2 leaves, holotype with counterpart, paratype with counterpart. Diagnosis: Oval, somewhat elongated leaves. Length 12 cm, greatest width 5,5 cm. Lamina terminating in short tip; narrowdng basally. Base of leaf weakly auriculate. Length of remaining petiole 1,0 cm. End of petiole characteristically tuberculate at base of leaf. Leaf margin irregularly dentate. No teeth on base; small, blunt, then flatly rounded smaller or larger teeth along margin. Midrib thick, emitting 6 — 7 pairs of opposite or subopposite, raised lateral branches. Secondaries directed upwards. Still another pair of thin laterals originating at base from midrib, bordering low^er pair of secondaries with camptodrome veins. Secondary veins locally bifurcate, emitting tertiaries on lower side. These latter also raised, camptodrome. Secondary veins connected with broken arches, emitting still smaller veins into teeth. Branched-off tertiaries locally excurrent directly into teeth, of a craspedodrome (?) type. Secondary veins connected with parallel extending, broken, forked and anastomosing tertiaries, their enclosed areas interwoven by very fine reticulation. Leaves coriaceous. Remarks: A find comparable to the leaf of Sloaneaephyllum hungaricum is the one described by STAUB (1887, p. 338, Taf. 34—35. Fig. 7) as Grewia transsylvanica from the Zsilthal flora. The base of STAUB'S Grewia transsylvanica is missing, thus the presence or absence of the slightly auriculate base cannot be established. The dentation of the Zsilthal leaf is more obscure than that of the Óbuda leaves, and the teeth are larger and fewer than in recent Grewia species. The evolvement of the secondary and tertiary venation is similar and it renders likely the allocation of the Zsilthal leaf to the genus Sloaneaephyllum. STAUB'S Grewia transsylvanica leaf also resembles the leaves of the recent Sloanea australis F. v. MÜLL. A leaf of a type similar to that of Sloaneaephyllum hungaricum had been described by BECKER under the name Morus eorubra (BECKER, 1960, p. 104, Pt. 28, Fig. 14) from the Lower Eocene flora of Mormon Creek (Montana). The Morus eorubra leaf is completely identical with the one published by MACGINITIE as an ,,unidentified leaf" from the Middle Eocene flora of the Sierra Nevada (MACGINITIE, 1941, Pt. 46, Fig. 5). However, the Morus eorubra leaves lack the leaf bases, their dentation is much larger and also different from that of the Óbuda leaves, precluding their closer association.