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The genus Pseudobornia (Arthrophyta) from Upper Devonian of Russia: morphology, anatomy and distributionтезисы доклада
- Авторы: Orlova O.A., Jurina A.L.
- Сборник: Programme et Abstracts. Third International Palaeontological Congress
- Тезисы
- Год издания: 2010
- Место издания: London
- Первая страница: 301
- Последняя страница: 301
- Аннотация: Pseudobornia represents a peculiar genus of arthrophytes, which combines morphological features of different plant groups. According to the reconstruction suggested by H.-J. Schweitzer (1967), Pseudobornia was a monopodially branched tree-like plant up to 15-20 m high and up to 0.5 m in diameter at the basal portion of axis. Pseudobornia (with a single species P. ursina) was firstly described by A.G. Nathorst (1894) on the material for impressions of axes, stems, leaves and fertile structures from the Famenian of Spitsbergen (Bear Island). Leaf and stem fragments of Pseudobornia were also known from the Upper Devonian of USA (Alaska) and Germany. Recently specimens of Pseudobornia were discovered among collections of the Arkhangelsk Regional museum and in the territorial informational fund “Arkhangelsknedra”. The findings originate from the Upper Frasnian of Russia, North Timan (the Cape of Ludovaty). The studied collection is represented by stem and leaf remains. In addition to a morphological description of the specimens some stem fragments were studied by scanning electron microscope. The anatomical structure of stems of different orders is similar and consists of narrow long tracheids with spiral and scalariform thickenings both on radial and tangential walls. The tracheid pitting is uniseriate. Pith rays were not observed. The primary xylem is supposedly preserved in studied stems. Consequently stems of Pseudobornia perhaps did not have secondary growth.
- Добавил в систему: Орлова Ольга Александровна