Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 88. (Budapest 1996)

Bajzáth, J.: Plant macrofossils from Hungarian Pleistocene II. Angiospermatophyta in Győrújfalu, West Hungary

SYSTEMATIC DESCRIPTIONS ANGIOSPERMATOPHYTA Alismataceae Alisma plantago-aquatica LINNAEUS, 1753 Description: The measures of the two whole fruit are 2.5 mm x 1.75 mm. The fruits are obovate and flattened. The base is slightly tapering and plucked out. The pericarps were contiguous with the seed. The seeds are little, 1.2-1.3 mm in length and 0.8 mm in width. Discussion: The exact determination of this species is based on the identification of the fruits. Among the fossils there were two opening fruits and the seeds were seen. This species is very abundant in different interglacials and occurs in the glacials too. Sagittaria sagittifolia LINNAEUS, 1753 Description: The seeds are 2.25-2.3 mm in length and 1.25 mm in width. The shape is horseshoe-like. Discussion: It is very similar to Alisma species, but Sagittaria is longer and the two stems of the seeds are not the same size. It is widespread in the Pleistocene deposits in Europe. Hydrocharitaceae Hydrocharis morsus-ranae LINNAEUS, 1753 Description: Small, obovate and fine seed 0.4 mm long and 0.25 mm in width. The surface of this specimen is very characteristically reticulate. The base and the summit of the seed is tapering. Discussion: This species is a typically intcrglacial aquatic plant. There were no remains in the glacial deposits in Europe (MAI & WALTHER 1988). Stratiotes aloides LINNAEUS, 1753 Description: The whole seeds are 8.5 mm x 2.3 mm in size. It is long-obovate. Its wall is smooth and a little ornamented with ridges. Discussion: This surviving species represents alone the Stratiotes genus. The water aloe genus has an interesting history which extends far back into the Tertiary. All records of the Stratiotes aloides are of interglacial age. It is another typical interglacial plant which indicates (with Hydrocharis) the true interglacial assemblage (GODWIN 1956). Potamogetonaceae Potamogeton perfoliatus LINNAEUS, 1753 (Figs 3^4) Description: This large specimen is 2.6-3 mm x 2-2.2 mm in size. From lateral view the endocarps are S-shaped or convex. Most of them have a short (0.5 mm long), broad-based beak (Figs 3-4). Discussion: The size and the shape shows great variation. A ALTO (1970) gave the detailed keys to distinguish the Potamogeton species. According to the literature this species is rare in