Alnus rhenana (P.WESSEL et C.O.WEBER) WINTERSCHEID et KVAČEK, 2014, WINTERSCHEID et KVACEK, Oligocene, Ludvikovice, 2014

Teodoridis, Vasilis, Kvaček, Zlatko, Radoň, Miroslav, Raprich, Vladislav & Bruch, Angela A., 2020, A New Oligocene Flora From Ludvíkovice Near Děčín (České Středohoří Mts., The Czech Republic), Fossil Imprint 76 (2), pp. 297-314: 303-304

publication ID 10.37520/fi.2020.024

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Alnus rhenana (P.WESSEL et C.O.WEBER) WINTERSCHEID et KVAČEK, 2014


Alnus rhenana (P.WESSEL et C.O.WEBER) WINTERSCHEID et KVAČEK, 2014  

Pl. 2, Fig. 10, Pl. 3, Figs 1–5

1856 Corylus rhenana P.WESSEL et C.O.WEBER   , p. 134, pl. 22, fig. 5.

2014 Alnus rhenana (P.WESSEL et C.O.WEBER) WINTERSCHEID et KVAČEK   , p. 22, pl. 4, figs 1–5, pl. 11, figs 4–6.

M a t e r i a l. Several fragments and incomplete leaves, impressions PA 1628, PA 1629, PA 1632, PA 1633, PA 1635– 38, PA 1640, PA 1642, PA 1643, PA 1650, PA 1655–56, PA 1657, PA 1658, PA 1663A, NM-G 12814.

D e s c r i p t i o n. Incomplete leaves and fragments are ovate to obovate, 23 to 85 mm long, 17 to 75 mm wide, apex acute to shortly attenuate, base rounded or slightly cordate, margin finely widely serrate, venation craspedodromous to semicraspedodromous, midrib thick, secondaries, subopposite to alternate, widely spaced, curved, originating at 30° to 50°, tertiary veins percurrent, straight, curved or forked, venation of the higher orders regular polygonal reticulate, areolation well-developed, 4 sided.

R e m a r k s.The foliage in the samples from Ludvíkovice is very similar to the leaf material described from Matrý and Žichov as Alnus rhenana   , which is typically long petiolate and variable in shape ( Ettingshausen 1869, Winterscheid and Kvaček   2014). In addition to A. rhenana   , narrow elliptic leaves of Alnus gaudinii (HEER) ERW.KNOBLOCH et KVAČEK   known from Bechlejovice, Kundratice ( Kvaček   and Walther 1998, 2004), Holý Kluk ( Radoň et al. 2006), Hrazený ( Kvaček   et al. 2015) and Seifhennersdorf ( Walther and Kvaček   2007), are also a very common Oligocene elements of North Bohemia and Saxony.