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

ТНЕАСЕЛЕ cf. Stuartia beckerana (LUDWIG) KIRCHHEIMER (Pl. VII, Figs. 17,18): Description: Fruit (capsule) without stalk, slightly laterally compressed, about 7 mm long and 3.5 mm wide, pentamerous, pentagonal with distinct edges and convex fruit wall between them, the outher surface is rough. Remark: Relatively small-sized, probably immature fruit which shows some similarities with capsules known as Stuartia beckerana. This species is well known from the Miocene and Pliocene of Europe (see KIRCHHEIMER 1957, Mai 1971, Van der BURG 1970, 1983, 1987), but generally, it Is rather rare. Material: 1 capsule. Inventorized under No BK-5520 POTAMOGETONACEAE Potamogeton sp. div. (PI. IX, Fig. 6): Description: Fruits (endocarps), relatively small, slightly flat laterally, thick-walled, with short style, 1.5 to 2 mm long, 1 to 1.5 mm wide, truncated at the base, contracted to the apex, dofsal side strongly convex, ventral side almost straight; keel reaching almost to the apex, rather robust; central depression relatively large, oblong, surface secondarily (imprints of quartz grains) pitted. Somewhat smaller and thln-walled endocarp and further half showing interior may represent some immature specimens of the same type, or other species. Remark^ Clear endocarps of Potamogeton which have not been closely determined for the poor material. Material: 5 specimens. Inventorized under Nos BK-5459, BK-5505, BK-5537 ALISMATACEAE Caldeela cf. cylindrica (E.M. REID) D0R0FEEV (PI. IX., Fig. 5): i Description: Fruits (endocarps), obovate in outline, 2 to 2.3 mm long and 1 to 1.5 mm wide, with ventral-apical style, about 0.22 mm long, dorsal side of endocarps is more convex than ventral side; surface with 2 to 4 longitudinal edges, finely pitted; pits arranged in the same longitudinal rows. Remark: Specimens well agree with some endocarps described from the Pannonian and Pontian of southern Moravia (CTYROKY- and KNOBLOCH 1976, KNOBLOCH 1981a) end from the Pannonian of northern Slovakia (KNOBLOCH 1980). The species is known from the Lower and Upper Miocene of Germany (GREGOR 1982, Van der BURG 1988). Material: 2 specimens. Inventorized under Nos BK-5497, BK-5518 HYDROCHARITACEAE Stratiotes tuberculatus С et E.M. REID (PI. VIII, Figs. 13-15, PI. IX, Figs. 7-12): Description: Seeds or seed halves of slender form, about 6 to 7 mm and 2.5 to 3 mm wide (but usually somewhat compressed and deformed); sculpture elements arranged in apparent and Interrupted rows, in some case strongly corroded, keel usually well developed; micropylar collar relatively small, tiny or absent; micropylar canal often ventral, directed at right angle of locule; neck Indistinct, raphe is not visible in the whole course but a hilum basal or subbasal

. Remarks: The sculpture of the seed is very variable even in the living species S. aloides L. (see COOK and URMI-KÖNIG 1983) therefore it may hardly be used as a reliable diagnostic feature in the fossil material. Generally, our material agrees with that of the species S. tuberculatus which has rather indefinite specific concept end may első be conspecific with S. kaltennordhelmensls (ZENK.) KEILH. In every case, both fossil species are evidently closely related and their demarcation in morphological features is not clear (see KNOBLOCH 1989). Material: 9 specimens Including seed helves and numerous fragments, further comparative material from the Nyugati (West/Mine/see PI. VIII, Figs. 13-15). Inventorized under Nos BK-5461, BK-5462, BK-5521 60