Szekessy Vilmos (szerk.): A Magyar Természettudományi Múzeum évkönyve 54. (Budapest 1962)
Rásky, K.: Tertiary plant remains from Hungary (Upper Eocene and Middle Oligocene)
Comparison with recent species: The leaf remains of Sloaneaephyllum hungaricum are best compared with those of the recent Sloanea australis F. v. MÜLL. The recent herbarium specimens, serving for comparison, originate from the shores of the Upper Williams River, north of Sydney, East Australia. On the recent leaves, the base is more auriculate than on the fossil ones, but the development of the tuberculum at the end of the petiole, the dentation and the venation are similar to each other On the fossil leaves, the secondary veins extend more upwards than on the recent ones. STERCULIACEAE Pterospermophyllum hornafrantzieni n. sp. (Plate IV, Fig. 1) Derivation of specific name: Named in Commemoration of Professor Dr. H. HORN AF RANTZIEN. Diagnosis: An elongated upper leaf part, with dripping tip. Measurable length 10,0 cm, greatest width of fragment 4,4 cm. Length of the dripping tip 2,0 cm (though immediate apex broken), width 0,2 cm. Margin of leaf fragment entire. Midrib raised and curved. Alternating, slightly arcuate, locally forking, and camptodrome secondary veins starting from midrib. In the dripping tip, secondary veins border midrib with gradually decreasing loops. Also tertiary veins well observable: thin, more or less perpendicular to secondaries and midrib, parallel w r ith each other, forking and anastomosing. Areas between tertiaries filled with polygonal venation. Leaf probably coriaceous. Material: 1 leaf impression. Remarks : The fragment cannot be identified with the leaf apex described by HEER (1883, Pt. 92, Fig. 7), as Pterospermites spectabilis HEER from the Tertiary of Greenland, since the upper portion of its lamina is broad, its apex blunt. Under the same name, HEER published another upper leaf fragment (1883, Taf. 81, Fig. 3—b), from the Paleocene formation of Upper Atanekerdluk (W. Greenland); the upper portion is considerably elongated but without the lengthy and extended dripping tip. Its venation resembles that of the fragment found in the Buda marl. In the absence of informations on the base of the leaves, one cannot establish any close relationship between the fragmentary specimens. Recently, SCHLOEMER — JÄGER published some leaf fragments by the name Pterospermites spectabilis HEER from the Paleocene flora of Atanekerdluk (W. Greenland), and designated them as Dicotyledonae incerti ordinis (SCHLOEMERJÄGER, 1958, p. 82. Pt. 13, Figs. 5—6, and Abb. 25: a, b). She considered their relegaGon to the family Sterculiaceae doubtful, as did HEER himself. SCHLOEMER— JÄGER'S Pterospermites spectabilis HEER leafragments cannot be associated with the Pterospermites leaffragments from Óbuda. SCHLOEMER— JÄGER communicated a most interesting leaf find, designated as Phyllites sp. indet. (SCHLOEMER-JAGER, 1958, p. 86, Textfig. 27, Pt. 14, Fig. 4), from the Spitzbergen (the Brögger Peninsula). This leaf, with the shape of its remaining lamina, dentation, venation and the characteristically thick upper portion of the petiole, is well referable to the leaves of the recent tree Halconia mindanensis (MERR.) ELM. from Mindanao (Philippines). We have designated the fossil as Halconiaephyllum schloemer-jägeri n. gen., n. sp. SCHLOEMER— JÄGER'S specimen, described as Phyllites sp., might also be compared with the recent species Luehea speciosa WILDD. (Sta Marta, Columbia), Luehea divaricata MART. (S. Brasil, Neu-Württemberg), Columbia mindanensis WARB., or any Belotia taxa, but, with regard to the venation and dentation, the difference concerning the latter species is greater than that which exists between Phyllites sp. and Halconia minaanensis.
