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Revision of Lepidodendron lycopodioides and L. selaginoides from Czech Carbon...
Rychnovský, Vojtěch ; Opluštil, Stanislav (advisor) ; Kvaček, Zlatko (referee)
The diploma thesis is focused on revision of the type collection of two similar arborescent Carboniferous lycopsids Lepidodendron lycopodioides and Lepidodendron selaginoides. Both species are often misinterpreted in the literature due to their obscure definition by Sternberg. Both species were revised morphometrically, allowing for their redefinition based on morphological characters. The emended diagnosis of both species is provided. Using of existing names of the species was solved in accordance with the International botanical code. Changes in various parametres during ontogenetic development of L. lycopodioides and L. selaginoides were described in detail by using morphometric analysis and both species were redefined. Klíčová slova: Lepidodendron lycopodioides, Lepidodendron selaginoides, pennsylvan, Intra-Sudetic Basin, Radnice Basin, morphometric analysis.
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Leptosporangiate ferns from the Carboniferous basins of Bohemia, selected taxa
Frojdová, Jana ; Opluštil, Stanislav (advisor) ; Kvaček, Jiří (referee)
The diploma thesis revises ten selected species of sphenopterid ferns of Carboniferous age deposited in the National Museum in Prague, the West-Bohemian Museum in Pilsen and the British Geological Survey in Keyworth, England. Sphenopterid ferns were studied based on reproductive organs aquired by maceration of coalified plant remains preserved as compressions. Sporangia and their annulus are important diagnostic features for individual genera and species of sphenopterid ferns and for selected species have not been described yet. Following species were studied: Boweria schatzlarensis, Myriotheca anglica, Renaultia crépini, Sturia amoena, Oligocarpia gutbiery, Zeilleria hymenophylloides, Zeilleria avoldensis, Discopteris sp. ("doubravensis"), Scolecopteris elegans a Waldenburgia corynepteroides. With the exception of Waldenburgia corynepteroides, Scolecopteris elegans, Zeilleria hymenophylloides and Zeilleria avoldensis species type material was studied. Maceration of sporangia of Boweria schatzlarensis showed presence of lateral annulus while in case of Myriotheca anglica the annulus is lateral or more likely of a special type, placed on both sides of the sporangia. Annulus type determination of Renaultia crépini also made possible to assign this species within the range of the genus Tenchovia and...
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Carboniferous tropical ecosystems of euramerican province
Frojdová, Jana ; Opluštil, Stanislav (advisor) ; Sakala, Jakub (referee)
This thesis deals with the tropical terrestrial ecosystems of Late Carboniferous (Pennsylvanian) time. It is especially focussed on description of the Carboniferous tropical forest and its components. Introductory parts of the thesis deal with the general characteristics of Carboniferous period, including fauna and flora, distributions of continents and how was the climate of this period. Second part follows the characteristics of particular components of the Carboniferous tropical forest, i.e. of individual plant groups and genera, and their ecological demands. Characterised are plants and their assemblages in tropical lowlands as well as in upland areas, rarely preserved in sedimentary record. In the next part I characterise the dynamics of the forest of Carboniferous tropics and discuss potential mechanisms which controlled the floristic changes including plant extinction. The role of climate changes, which had great influence on vegetation, is discussed as the possible main control. In the separate chapter I describe extinction of arborescent lycopsids. Key words: ecosystem, tropical forest, lowland, climate changes
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