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

Nuphar palfalvyi BÙZEK et LASZLÓ sp. n. (Pl. IV, Figs. 1-5, Pl. X, Figs. 3,4): Diagnosis: Seeds up to 3.5 mm long and up to 3 mm wide, raphe ridge unclear, testa 50 to GO длп thick, surface cells slightly elongated, 20 to 25 ,um large, sigmoidal, very regularly developed, arranged in 20 to 25 rows at a distance of 0.5 mm, with thick, elevated lateral walls. Description: Seeds relatively thin-walled (testa about 50 to 80 >um thick), quite compressed, ovate to oval in outline, up to 3.5 mm long and up to 3 mm wide, surface cells on the average about 20 to 25 jum large, in the form of horizontal quadrangles or polygons, arranged in the more or less distinct, fine longitudinal rows (in number of about 20 to 25 at a distance of 0.5 mm), but their arrangement seems to be sometimes not much regular; SEM shows slightly elongated surface cells, somewhat sigmoidal in form and with thick, elevated lateral wells; raphe ridge not much clearly visible externally; small apical cap арреагз to be circular, about 0.50 mm in diameter, with central micropyle; de facto cap (and eperture) oval, because the hilum (in the form of "a piece of attached debris") transgressing the margin of the cap is pushed off together as a complex cap; therefore the hilar end of the cap (aperture) is usually wedge-tailed and general length of such cap is up to about 1 mm. Reirarks: The seeds show clear relations to those of Nuphar SMITH (in relative position of the micropyle and hilum to apical cap). Seeds of N. canallculatum C. et E.M. Reid are rather similar in this respect but their surface cells seeir. to be not so wide as those of present material. Seed surface documented by SEM (Pl. X, Figs. 3, 4) 1я well comparable with that of Nuphar adveniformis D0R0FEEV (WIELICZKOHICZ 1990) but cellular structure is much more regular in our material. Therefore it cannot be referred to these representatives of Nuphar and was described as a new species. Material: 15 specimens., inventorized under Nos BK-5485, BK-5539 Pseudoeuryale cf. dravertii D0R0FEEV (PI. IV, Figs. 11-15, PI. X, Figs. 1,2): Description: Seeds strongly flattened and deformed, relatively thick-walled (testa 0.270 to 0.360 mm in thickness), generally obovate to ovate-oval in outline, about 5.9 to 6.3 mm long and 4 mm wide; small circular apical cap (or germination aperture), about 0.6 to 1 mm In diameter, probably with central micropyle (the cap is present in only ore specimen end is damaged); adjacent and evidently touching this cap (or aperture) light oval scar (hilum) with central depression; cap end scar are surrounded by dark end lustrous hem which is between the both structures slightly contracted; raphe ridge not visible externally; very damaged and secondarily wrinkled external surface covered by many imprints of quartz grains, rarely shows very fine pitting which représente an original cellular structure of the testai surface; cells hexagonal or pclygonal, about 0.005 in diameter, without a central papilla. Remarks: In general, fossil Nymphaeaceae seeds may be barely Identified withcut morphological and anatomical details of their surface structures. According to the relative position of the micropyle and hilum to cap present material is well comparable with the genera of the Euryale group, namely genus Pseudoeuryale D0R0FEEV (for generic differences - see Oorofeev 1972, in TAKHTAJAN 1974). In the light microscopy the character of the epidermal cells has not been clearly recognized, however, according to informative SEM observations it appears to be rather smoot as in Pseudoeuryale than papillate as In Palaeoeuryale D0R0FEEV. Present material differs from the species Pseudoeuryale limburgensis (C. et E.M. REID) D0R0FEEV, for lstance, by the smaller seed size and presence of hem around the cap and scar. In this respect it resembles seeds of the species P. dravertii described from the Upper Miocene of Sibiria. However, it differs from our species in the thicker seed-wall and larger epidermal cells. Euryale lissa C. et E.M. REID (1915) from the Brunssumian of the Netherlands, which is considered to represent net fully developed seeds of Euryale limburgensis (KIRCHHEIMER 1957), is rather similar to our material. One isolated cap published as Euryale sp. from the Panrorlan of southern Moravia (KN0BL0CH 1976) might belong to our species but the others from the Pannonian anc" Pontian of Slovakia (KN0BL0CH 1981c), which are clearly oval in from, cannot be protably connected with Pseudoeuryale. Material: 5 seeds and 1 seed broken into fragments. Inventorized under Nos BK-5511, BK-5524 54