Epipremnites ornatus (E. M. REID et CHANDLER) GREGOR et BOGNER

Dedicated in memory of the late FrantiŠek Holý (1935 - 1984), an eminent Czech palaeobotanist, Holý, František, Kvaček, Zlatko & Teodoridis, Vasilis, 2012, A Review Of The Early Miocene Mastixioid Flora Of The Kristina Mine At Hrádek Nad Nisou In North Bohemia (The Czech Republic), Acta Musei Nationalis Pragae Series B 68 (3 - 4), pp. 53-118 : 64-65

Epipremnites ornatus (E. M. REID et CHANDLER) GREGOR et BOGNER

Pl. 5, fig. 8

1926

1978

1984

Epipremnum ornatum E. M. REID et CHANDLER , p. 83, pl. 4, figs 24-25 (Bembridge).

Epipremnum (?) ornatum E. M. REID et CHANDLER ; Holý, p. 2 (Hrádek/N., Kristina Mine).

Epipremnites ornatus (E. M. REID et CHANDLER) GREGOR et BOGNER , p. 6, text-fig. 1, 2/6 (Bembridge).

Seed asymmetrical, reniform, 2.5 mm long, 1.5 mm high, slightly compressed, both ends slightly taller than the saddle, asymmetrically curved, chalaza area rounded, micropyle area obliquely truncate, tiny hilum on the saddle scar, rows of pits on sides ( Holý 1975, p. 17, pl. 21, fig. 1).

D i s c u s s i o n: Holý (1975) doubted the systematic position of these seeds relative to Epipremnum . Also according to Gregor and Bogner (1984, 1989) the affinity of such fossils to Epipremnum is equivocal and they were correct in establishing a fossil genus.

M a t e r i a l: One seed, G 3033.

Potamogetonaceae RCHB.

Potamogeton L. Potamogeton heinkei MAI

Pl. 5, figs 9-10

1964 Potamogeton heinkei MAI , p. 78, pl. 4, figs 1-6 (Hartau). 1978a Potamogeton heinkei MAI ; Holý, p. 2 (Hrádek/N., Kristina

Mine).

Endocarps widely ovoid, 1.2–1.9 mm long, 0.9–1.5 mm wide (L/W index 1.1–1.6), smooth on surface, walls thick, base rounded, apex more or less rounded with a tiny point on ventral margin, sides flat, weakly convex to slightly concave, germination valve roundish, without keel ( Holý 1975, p. 99, pl. 21, figs 9-12.).

D i s c u s s i o n: According to Holý (1975) this type of endocarps co-occurs with the next species and to distinguish between them is often difficult. A diagnostic feature of Potamogeton heinkei is the lack of the style base and a very short connection between the apex and the top of the germination valve. Very similar endocarps produce the nearest living relatives P. pauciflorus PURSH. , P. foliosus RAF. and P. heterophyllus SCHREB. ( Holý 1978a, p. 100) . Teodoridis (2003) reported morphologically similar endocarps identified as Potamogeton wiesaensis KRICHHEIMER from the Hr 51 drill core near Hrádek /N. However, P. wiesaensis shows a distinctly well-developed keel of germination valve, which is lacking in P. heinkei and also P. nochtensis MAI ex HOLÝ (see Teodoridis 2007). On the other hand, Teodoridis (2003) considered a possible affinity of P. wiesaensis with both the latter mentioned species because of smaller size of endocarps with a relatively indistinct keel and shallow central depressions.

M a t e r i a l: 60 endocarps, G 3040, 8973-74, Gs 110.

Potamogeton nochtensis MAI ex HOLÝ Pl. 5, figs 11-12

1978a Potamogeton nochtensis MAI ex HOLÝ , pp. 2, 10, pl. 3, figs 1-10 (Hrádek/N., Kristina Mine).

For the description and discussion see Holý (1978a).

M a t e r i a l: About 100 endocarps, G 3041, 4289-99,

Gs 83, 107, 110.

Arecaceae SCHULTZ SCH.

Spinophyllum HUARD