Microzamia gibba (A. E. REUSS) CORDA

Greguš, Josef & Kvaček, Jiří, 2015, Revision Of Cenomanian Flora From The Maletín Sandstone, Acta Musei Nationalis Pragae Series B 71 (3 - 4), pp. 315-364 : 319-320

cf. Microzamia gibba (A. E. REUSS) CORDA in A. E. REUSS

Pl. 3, Fig. 1a, b

N e o t y p e: NHMW_A. 5953a, J. Kvaček 1997, p. 85, pl. 1, fig. 1.

T y p e l o c a l i t y: Třebívlice. T y p e h o r i z o n: Bílá Hora Formation, Turonian,

Upper Cretaceous.

M a t e r i a l s t u d i e d: GPIT/PL_634.

O c c u r r e n c e: Maletín, Vyšehořovice (Peruc-Korycany Formation).

D e s c r i p t i o n. The specimen from Maletín locality represents a unique (GPIT/PL_634, Pl. 3, Fig. 1a, b) impression of a strobilus (16× 82 mm), which is longitudinally ovate, apically acuminate and narrowed in the base. Helically arranged scales represented by hexagonal peltate heads are 5 mm high and 7 mm wide. The heads are covered with protuberances and trichomes. In central parts of some heads there are apparent four larger protuberances (Pl. 3, Fig. 1b).

D i s c u s s i o n. The neotype chosen by J. Kvaček (1997) has different preservation than the specimen from Maletín (GPIT/PL_634). However, numerous of specimens from the locality of Vyšehořovice show a similar mode of preservation ( Velenovský 1885b, pl. 3, fig. 5–16, pl. 4, fig. 6), and argue for including the material studied in this taxon, particularly due to the presence of tubercles in central parts of peltate heads. Bayeritheca hughesii J. KVAČEK et PACLTOVÁ from the Cenomanian of Březany locality (J. Kvaček and Pacltová 2001) differs from our material in lacking well pronounced centrally placed tubercles on heads. However, the material studied lacks internal structures, which are important for a definite determination.