L. Hably szerk.: Studia Botanica Hungarica 22. 1990 (Budapest, 1990)
Sterculiaceae Stercülia L. Sterculia sp. Pl. XXXI, Figs. 1-2; Figs. 85-86. Material: No.: 76.115.1( =76.121.1.counterpart) 1 piece Description: A very interesting print of the Vértesszőlös flora, which is reminding us with its triple lobes to several genera. (e.g., Acer , Hedera) , the venation, however, is different from that of the mentioned taxa. The margin of the leaf is entire, thus we can exclude species with a lobed or toothed margin. In case of the lobed leaf structure we can generally observe, that starting from the basis of the leaf, besides the midvein, there are two (or more) strong secondary veins starting which run directly into the lobes, i.e., the venation is actinodromous . This phenomenon can be observed even at the Sterculias as well. In case of this species, however, a basically different venation can be observed. Unfortunately, the basis is fragmented, but still wé can observe that the venation is not actinodromous, but craspedodromous, that is, at some distances from the midvein, there are secondary veins branching off at the following angles of divergence: 56 , 50 , 48 , 45 . The venation of the side lobes are very specifically formed from the three veins of the second order. There are branches running in the direction of the secondary veins from the right and the left side in the form of tertiary veins originating from the neighbouring secondary veins, and at these branches the secondary veins themselves are turning a little bit inside. The apex of the central lobe of the leaf is acute, that of the two side lobes is obtuse. The widest part of the leaf is 6 cm, its length cannot be measured with certainty. The other important feature of the species is, that the curvature between the lobes is not acute, but obtuse. The angle between the central and the side lobes is about 115 . The species is essentially different from the rest of the Sterculia species known so far. Sterculia labrusca Ung., for example, is of completely different character with its narrow, ïïïin, acute lobes. The species 5. tenui- nervis Heer is also completely different from this species. Neither the venation, nor the form of the lobes are identical. In case of the S. tenuinervis , the angle between the lobes is acute. The Sterculiphyllum sp. published by KNOBLOCH (1969) from the Moravian flora does not agree with this species. The medial lobe here is essentially wider than the side ones, and it has more apices. The form published by MAKULBEKOV (1972) under the name of S. kalkama- nica is essentially different in its form as well as the vein system from the Vértesszőlős specimen. It cannot be related either to the species 5. rariner- via Kol., described from the Pliocene flora of Kodor by KOLAKOVSKI (1964), which has a simple leaf construction. Rosaceae Rosa L. Rosa lignitum Heer 1669 Pl. XXIX, Fig. 3. 1869 Rosa lignitum Heer; Heer, p. 98, Pl. 30, Fig. 33. 1971 Rosa bohemica Engelhardt; Bűzek, p. 61, Pl. 24, Figs. 1-9. 197B Rosa lignitum Heer; Mai et Walther, p. 101, Pl. 4, Figs. 8-10; Pl. 40, Figs. 3-11. Material: No. :•76.116.1. 1 piece 33
