Laurophyllum rugatum KVAČEK et BŮŽEK

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 : 62

Laurophyllum rugatum KVAČEK et BŮŽEK

Pl. 1, figs 15-17, pl. 11, figs 4-5

1966

1971

Laurophyllum rugatum KVAČEK et BŮŽEK , p. 292, pl. 3, figs 3-5, pl. 4, fig. 4 (Hrádek/N., Kristina Mine).

Laurophyllum rugatum KVAČEK et BŮŽEK ; Kvaček, p. 61, pl. 8, figs 5-6, text-fig. 6 (Hrádek/N., Kristina Mine).

Fragmentary leaves simple, lamina elliptic, 21–23 mm long, 10–18 mm wide, base cuneate, decurrent into an up to 7 mm long petiole, apex not preserved, margin entire, venation brochidodromous, midrib strong, straight, secondary veins thinner, straight, looping by margin, alternate, originating at an angle of 30–40°, tertiary veins perpendicular, straight to sinuous, venation of the higher orders regular polygonal reticulate, areolation well developed, 4-sided, veinlets unbranched to rarely once branched. Adaxial epidermis strongly cutinized, smooth except for radial striation around sparsely distributed simple trichome bases, showing polygonal outlines of non-modified cells ca. 12–25 µm in diameter, anticlinal walls thick, straight. Abaxial epidermis thinly cutinized, densely covered by rounded simple trichome bases, non-modified cells with slightly finely wavy anticlinal walls, stomata brachyparacytic, rounded to broadly rhombic oval, (10–) 15–20 µm in diameter showing broad stomatal ledges reaching mostly to the stomatal poles. Trichome bases rounded, very dense over the abaxial leaf side.

D i s c u s s i o n: Laurophyllum rugatum is a rare, easily recognizable species without clarified affinities to modern genera. Besides the Zittau Basin, it was also recovered from the Cheb Basin, in Saxony and Wackersdorf (see Knobloch and Kvaček 1976).

M a t e r i a l: Isolated leaf compressions on slides, G 8963a -b, 8964a-b, 8965a-b (KR 3, 7, 34).