October 13, 2023
Cooksonia - Extremely rare oldest Silurian fossil land plant
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Amberabg Extremely rare, oldest fossil land plant Species: Cooksonia sp. Upper Silurian (Ludlowian/Pridolian) of the Holy Cross Mountains, Poland. Kielce regionDimension: matrix 40x26mm, plant: 5mm Cooksonia sp. Is shown in Fig. A, B, C. This is a branched, leafless axis terminated. The total length of the specimen is 6.6 mm. The width of its main axis is 0.55 mm, and this increases slightly at the point of branching. Above the bifurcation, the width of axes is about 0.4 mm, and the angle between them is about 70°. The sporangium is oval, its height is somewhat less than its width (1.65 mm and 1.98 mm respectively). The axis terminating in the sporangium is broken, therefore, its orientation is probably not natural. Consequently, both the shape and dimensions of the sporangium could have been altered somewhat during fossilization. Nevertheless, all the features described above conform with the original defini - tion of the genus Cooksonia given by Lang (1937) and with other more recent descriptions (e.g., Edwards 1979; Edwards and Rogerson 1979). Most of the other relatively well preserved specimens show morphological features, which may correspond to the genus Cooksonia but none of these bears sporangia. Such sterile axes are conventionally named Hostinella (e.g., Edwards et al. 2001). These specimens have slender, naked and
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