Mesenea bohemica (Corda) J.Kvaček

Plant Fossil Names Registry Number: PFN000827

Act LSID: urn:lsid:plantfossilnames.org:act:827

Author: J. Kvaček

Rank: species

Basionym: Pecopteris bohemica Corda in Reuss

Genus:

Reference: Kvaček, J. (1999): New data and revison of three gymnosperms from the Cenomanian of Bohemia - Sagenopteris variabilis (VELENOVSKÝ) VELENOVSKÝ, Mesenea bohemica (CORDA) comb. n. and Eretmophyllum obtusum (VELENOVSKÝ) comb. n. – Acta Musei Nationalis Pragae, Series B – Historia Naturalis 55(1–2): 15–24.

Page of description: 18

Types

Original diagnosis/description

P. fragmentum pinnatum, lanceolatum, rhacho sulcata, pinnulis lanceolatis acutis subpatentibus.

Emended diagnosis

J.Kvaček (Acta Mus. Nat. Pragae, Ser. B, Hist. Nat., 55 (1-2): 18:

Fronds tripinnate, large. Shape ofprimary pinnae unknown, apical parts of secondary pinnae lanceolate, partly overlapping, rachis robust. Tertiary pinnae lanceolate, parallel-sided in the basal and medial parts, graduaIIy narrowing to the apex. Pinnules lanceolate or oblong, shortly decurrent, with acute apex, bearing one or several teeth on abmedial margin. Venation very inconspicuous; one primary vein and several secondary veins entering the pinnules at the base. Pinnules coriaceous, bearing thick cuticle. Adaxial cuticle showing elongate cells ; some ofthem conspicuously smaller and thickly cutinized. Abaxial cuticle consisting oftetragonal or polygonal cells, bearing haplocheilic stomata, irregularly orientated. Stomatal apparatus incompletely dicyclic, guard cells sunken, overlapped by 4(6) subsidiary ceIls which form an oval or circular border around the stomatal pit; two ofsubsidiary cells in lateral position, two others in polar position. Trichome bases rounded, frequent near the rachis. Some of ordinary ceIls thickly cutinized.

Stratigraphy

Cretaceous, Upper Cretaceous, Cenomanian
Peruc-Korycany Formation

Locality

Czech Republic
Mšené-lázně (= Msseno bei Schlan, by Corda)