Jana Čepičková , Jiří Kvaček
2020 | ročník 76 | číslo 2 | stránky 315–324
DOI:
10.37520/fi.2020.025
Abstract
Nilssonia mirovanae sp. nov. is described from the Late Cretaceous Cenomanian of the Bohemian Cretaceous Basin. It comes from the best-exposed portion of the Peruc-Korycany Formation, in the Pecínov quarry, west of Prague, the Czech Republic. Although preserved only as a fragment of a pinna, it clearly shows haplocheilic stomata. In this paper, we compare N. mirovanae with Pseudoctenis babinensis J.Kvaček from the same horizon. These two cycads have similar adaptations for surviving water stress: thick cuticles and sunken stomata, characteristic features among gymnosperms indicating adaptation to xeromorphic plants, cuticle analysis, Late Cretaceousdrought.
Key words
xeromorphic plants, cuticle analysis, Late Cretaceous
Eduardo Barrón , Jiří Kvaček , Jiřina Dašková
2019 | ročník 75 | číslo 2 | stránky 141–152
DOI:
DOI 10.2478/if-2019-0012
Abstract
A preliminary revision of the palynological collection of Professor Blanka Pacltová was carried out considering samples from the middle Cenomanian of the Peruc-Korycany Formation, the basal most member of the Bohemian Cretaceous Basin (the Czech Republic). This collection is mainly composed of slides with palynological residues for light microscope study, which were mounted in the 1960s and 1970s. This work presents an evaluation of the state of preservation of this collection, taking into account the presence of ancient angiosperm pollen types. High percentage of preparations is affected by degradation of glycerine jelly and their remounting is necessary. The present study additionally suggests a methodology for curation of this collection with the objective of long-term preservation.
Key words
palynological collection, Blanka Pacltová, curation, angiosperm pollen types, early Cenomanian, Bohemian Cretaceous Basin, the Czech Republic
Milan Libertín , Jiří Kvaček , Jiří Bek , Petr Štorch
2018 | ročník 74 | číslo 3-4 | stránky 327–333
Mário Miguel Mendes , Pedro Dinis , Jiří Kvaček
2018 | ročník 74 | číslo 3-4 | stránky 317–326
Jiří Kvaček , Jiřina Dašková
2018 | ročník 74 | číslo 1-2 | stránka 8
Jiří Kvaček , Zuzana Heřmanová , Jana Bruthansová , Jakub Karch , Jan Žemlička , Jan Dudák
2018 | ročník 74 | číslo 1-2 | stránky 179–188
Evelyn Kustatscher , Giovanni G. Scanu , Jiří Kvaček , Johanna H. A. Van Konijnenburg-van Cittert
2016 | ročník 72 | číslo 3-4 | stránky 140–154
Josef Greguš , Jiří Kvaček
2015 | ročník 71 | číslo 3-4 | stránky 315–364
Jiří Kvaček
2014 | ročník 70 | číslo 3-4 | stránky 211–218
DOI:
10.14446/AMNP.2014.21
Abstract
A new fossil eusporangiate fern Marattiopsis vodrazkae J. Kvaček, sp. nov. has been recovered from the Hidden Lake Formation, the Campanian of James Ross Island, Antarctica. Its fertile and sterile pinnules are described and compared to the other species of the fossil genus Marattiopsis Schimper and the living genera Marattia, Ptisana and Eupodium (Marattiaceae). In contrast to the other species of the genus Marattiopsis, M. vodrazkae is characterised by stalked synangia, a smaller number of sporangia per synangium, generally small sized pinnules, and the absence of venuli recurrentes. It shows a mosaic of characters present in the living Marattiaceae: it shares stalked sporangia with the genus Eupodium and some species of Marattia and exhibits a suture (an abscission scar at pinnule bases), a character typical for the genus Ptisana. Additionally, M. vodrazkae provides important palaeoenvironmental signals for climate reconstructions, arguing for warm (paratropical to warm-temperate) and humid climatic conditions on the Antarctic Peninsula and adjacent volcanic islands during the Campanian.
Key words
Marattiaceae, Campanian, Cretaceous, James Ross Island, Antarctica
Jiří Kvaček
2013 | ročník 69 | číslo 3-4 | stránky 123–128
Adam Halamski , Jiří Kvaček
2013 | ročník 69 | číslo 1-2 | stránky 83–86
Josef Greguš , Jiří Kvaček , Adam Halamski
2013 | ročník 69 | číslo 1-2 | stránky 69–82
Richard Pokorný , Jaroslav Kaše , Jiří Kvaček , Kamil Zágoršek , Tomáš Kočí , Jiří Žítt
2012 | ročník 68 | číslo 3-4 | stránky 119–131
Zuzana Heřmanová , Jiří Kvaček
2012 | ročník 68 | číslo 1-2 | stránky 47–50
Jiří Kvaček
2008 | ročník 64 | číslo 2-4 | stránky 125–131
Jiří Kvaček
2007 | ročník 63 | číslo 2-4 | stránky 75–83
Jiří Kvaček
1999 | ročník 55 | číslo 1-2 | stránky 15–24