L. Hably szerk.: Studia Botanica Hungarica 22. 1990 (Budapest, 1990)

TAXONOMY Pteridiaceae Adiantum L. Adiantum capillus-veneris L. Pl. I, Fig. 1. Material: No.: 76.101.1. 1 piece Description: The margin of the leaflets is crenate. There are two veins running into the leaf from the shaft petiole branching off and running apart in a forking way. The sporangia are placed at the margin of the leaf. Finds of the Adiantum capillus-veneris L. are very rare. It is known from fossil evidence of the Arizona Pleistocene only. The genus itself is known since the Carboniferous period, comprising 27 fossil genera altogether. The species A

. capillus-veneris is living recently as well. Its area is determined by microclimatological factors. This species requires a constantly wet, damp environment and temperate climate. It is currently known in Hungary around thermal springs and inside wells. In the Upper Oligocène, the temperate climate, relatively higher temperature and atmospheric humidity was possibly given around the Taxodium marshes. A single piece of fossil item, however, is not enough to state that it was a rare element of the Tertiary flora. This plant, due to its fine, dissected leaflets was possibly not resistant enough to endure the trials of fossilization . Pineaceae Pinus L. Pinus tuzsoni Novak 1950 Pinus Tuzsoni Novak; Novak, p. 49, Pl. 1, Fig. 1. 1979 Pinus tuzsoni Novak; Hably, p. 34, PI. 3, Fig. 2. Material: No.: 76.104.1. 1 piece Description: There is a three-needles leaf present in the flora. The length of the leaves cannot be established because of their fragmentary state. The length of the most complete needle is nearly 6 cm, but even this one is not complete. Such three-needles leaves are frequently found in the Hungarian Lower Oligocène, mainly in the Tard Clay Formation. NOVAK (1950) described the species from this formation, from the locality Kiseged. Triple needles were found at the Budapest localities of the Tard Clay Formation as well: VARGA (1956) mentioned it from the Budaújlak Lower Oligocène, ANDREÁNSZKY (1963), PÁLFALVY (1978) from the Buda part of the section opened during the construction of the underground train (METRO). HABLY (1979b) mentioned the species from the borehole marked H. Probably the same species lived on during the Upper Oligocène of Vértesszőlős as well. Its more specific relations cannot be established lacking the cone. There are several more needles of Pinus encountered in the flora, which are however very fragmentary, therefore we can say nothing for sure about them. The species P. tuzsoni is not very informative in respect of climate and humidity, similar to other fossil Pinus species. Pinus sp. Material: No.: 76.8.1.; 76.23.1.; 76.28.1.; 76.59.1.; 76.121.1. 5 pieces 6