Alnus gaudinii ( HEER ) KNOBLOCH et KVAČEK

Alnus gaudinii ( HEER) KNOBLOCH et KVAČEK

Pl. 15, Fig. 5–7

1859 Rhamnus gaudinii HEER , p. 79, pl. 124, fig. 4–15, pl. 125, fig. 1, 7, 13.

1961? Pterocarya aff. denticulata ( GÖPPERT) SCHLECHTENDAL ; Knobloch, p. 264, pl. 11, fig. 10.

1961 cf. Alnus kefersteinii ( GÖPPERT) UNGER ; Knobloch, p. 267, pl. 2, fig. 9, 11.

1976 Alnus gaudinii ( HEER) KNOBLOCH et KVAČEK , p. 33, pl. 6, fig. 1, 3, pl. 7, fig. 1, 5, pl. 13, fig. 4, pl. 15, fig. 1–4, 7–8, 10–11, 15, 17, pl. 16, fig. 1–5, pl. 19, fig. 15, pl. 20, fig. 10, text-fig. 11–12.

Leaves oblong to narrow ovate, incomplete in length, 23–30 mm wide, on margin simple serrate, teeth blunt, almost glandular, quite widely spaced, secondary veins eucamptodromous-semicraspedodromous, at angles of 30– 35°, partly looping, tertiary veins oblique or perpendicular, prominent, higher-order venation distinct.

D i s c u s s i o n. Knobloch (1961) compared some alder leaf impresions from Knížecí with Alnus kefersteinii , which is based on generative organs, and erroneously compared some leaf impressions with the Juglandaceae (as? Pterocarya aff. denticulata ( GÖPPERT) SCHLECHTENDAL ). Similar foliage occurs e.g. at Kundratice, from where the epidermal structure has also been obtained ( Kvaček and Walther 1998).

M a t e r i a l s t u d i e d: Leaf impressions-compressions, NM-G8603a, b, EK 328–341.