Folia Historico-Naturalia Musei Matraensis - A Mátra Múzeum Természetrajzi Közleményei 17. (1992)
Bužek, Č.–László, J.: Contribution to the Upper Pannonian flora from Visonta, northern Hungary
EOUISETACEAE Equisetum sp. Description: A single stalk fragment of 1.6 em's length and of 0.6 em's width. The stalk is divided into parts of more or less of the same size by 4 nodes. The suture lines of the nodes are well developed. The ribs running parallel to the longitudinal axis of the stalk are also well discernible yet there are only a few of them. The traces of leaves in verticillate position are uncertain, hardly discernible. Remarks: Palynological studies made on the material of the Thorez open-cast mine at Vlsonta (Mrs. NAGY, L. 1958. PÄLFALVY, I. - RÁKOSI, L. 1979) mentioned the presence of Equisetum sp. spores. It's macrofossil remains of Pannonian age has been unknown from Hungary so far. Material: 1 stalk fragment, the material is in the Paleobotanical collection of the Hungarian Geological Survey, under the Inventorized No BK-5492 . SALVINIACEAE Salvinia cf. Intermedia NIKITIN ex DOROFEEV (PI. II. Figs. 1-4): Description: Megasorl (sporocarps) mostly more or less compressed and deformed, generally ovate in outline, with acute and shortly mucronate distal end and broad-rounded or truncate proximal end, usually covered by thin sporocarp wall (Indusium) with longitudinal vascular bundles well seen: megasorl rather varying in size, length 1 to 1.590 mm, width 1 to 1.360 mm; one complete megasorus contained 11 megasporangia, each of them consisting of single megaspore, in some cases with traces of thin sporangium wall in the form of netlet on the surface. Megaspores 0.500 to 0.610 mm long and 0.350 to 0.420 mm wide, elongate-ovate, rounded at the end and somewhat narrowed at the proximal one; proximal part not separated from the rest of megaspore body, with trllete mark which is usually closed and almost not visible (they are most probably Immature megaspores); the surface of this proximal part is more structured than that of the rest of the megaspore body where characteristic folds and starshaped depressions are seen. Remerks: The species has clearly differentiated sorl in male and female ones. In our material, however, only megasorl are present. Morphologically, megaspores seem to be intermediate forms between those of fossil Salvinia intermedia NIKITIN ex DOROFEEV and recent S. natans (L.) AUBL. which belong to young sect. Salvinia. From the Pannonian and Pontian of southern Moravia and from the Upper Miocene of northern Moravia megaspores of Salvinia cerebrate NIKITIN ex DOROFEEV (sub Salvinia reussil ETT.) have usually been described (KN0BL0CH 1981a, GABRIEL et al. 19B2). The common occurrence of S. intermedia and S. cerebrate has clearly been evidenced in the Meotian of southern Ukraine and both species were probably present in the Upper Miocene of Poland as well (LAUCUCKA-ORODONIOWA 1958). Besides, the former species has also been found In the Sarmatian of Lower Don, Ukraine and in the Pliocene of Lower Don (DOROFEEV 1955a, b). Material: About 30 megasorl and a few isolated megaspores., inventorized under Nos. BK-5457, BK-5530. TAX00IACEAE Taxorilum sp . (pi. VIII, Fig. 12): Description: Seed approx. triangular, with winged and undulate convex margin, 9 mm in length and 4 mm in max. width; surface with a few longitudinal ribs, somewhat winged as well. Remark: The fossil is comparable in some respect with seeds of Taxodium, however, it does not well agree with them in the surface morphology. Nevertheless, the seeds of Taxodium are very variable (see BUZEK end HOLf 1964). Material: 1 specimen., inventorized under No. ВК-5534. 51
