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Cooksonia is an extinct group of primitive land plants, treated as a genus, although probably not monophyletic. The earliest Cooksonia date from the middle of the Silurian (the Wenlock epoch); the group continued to be an important component of the flora until the end of the Early Devonian, a total time span of .
Species belonging to the genus Cooksonia were among the first and most successful vascular land plants found in all the above-cited areas except for northern Greenland and Australia. A distinctly endemic group is represented by the genus Baragwanathia during Ludlow times in Victoria, Austl. Read More.
Apr 30, 2018 · Ancient fossil Cooksonia plants from the Czech Republic are among the largest known early polysporangiate plants from when vascular plants were colonizing the land.
Cooksonia includes the oldest known plant to have a stem with vascular tissue. The oldest known vascular plant is Cooksonia. Branches on this plant were about 6.5 cm long. Sporangia were terminal, that is, on the tips of the branches.
Apr 19, 2015 · The most enduring of Lang's achievements was his discovery and characterization of the plant he named Cooksonia. Fossils attributable to this genus have slender bifurcating systems, measuring from about 1 cm to no more than 6 cm in length ( figure 2 a–c ), that completely lack leaves of any kind.
Dec 22, 2022 · Early analyses placed Cooksonia in the tracheophyte lineage 79, and at least some Cooksonia fossils possess putative water-conducting cells, distinguishing them from eophytes.
Sep 4, 1997 · The discovery of previously unrecognized diversity in extinct Cooksonia and similar early fossils (such as Tortilicaulis, Uskiella, Caia 15,16,17, 81) suggests that simple early land plants (once...
Apr 8, 2016 · Several Cooksonia-like taxa lump fossils with axial widths spanning over an order of magnitude—from necessary physiological dependence to potential photosynthetic competence—informing understanding of the evolution of an independent sporophyte and the phylogenetic relationships of early vascular plants.
Feb 3, 2015 · Paleobotanists place the fossil remains of these newly evolved vascular plants in the genus Cooksonia. Based on what we would call a plant today, Cooksonia probably pushes the limits. However, in some species the branching structure is full of dark stripes, which have been interpreted as vascular tissues.
Cooksonia is genus of early true vascular plants that were leafless and rootless plants, with spore-bearing upright forked stems. These plants may have been photosynthetic in the gametophyte phase, and non-photosynthetic in the upright, spore-producing (sporophyte) portions.
