| P number: | P521014 |
|---|---|
| Caption: | A fossil specimen of Equisetum campbelli Forbes. A fossil plant. (Plantae.) Ardtun, Bunessan, Mull, Argyllshire, Scotland. |
| Description: | Equisetum is a horsetail plant and is the only surviving horsetail genus to occur today. British Geological Survey Biostratigraphy Collection number GSE 12967. Equisetum is a sphenopsid, a type of pteridophyte, the spore-bearing vascular plants. It is characterized by distinctly jointed sporophyte stems. At each joint there is a whorl of slender leaves and sporangia that diverge from the main stem in a circular fashion. Horsetails first appeared in the Devonian and were particularly abundant in the Carboniferous from when they started to decline. This specimen is from the Tertiary. The Pteridophytes include the horsetails, psilophytes, clubmosses (Lycopods) and ferns (Pteropsida). They are mostly small herbaceous plants having no growth of secondary wood apart from some species of Lycopods that had secondary tissue and grew to great size in the Carboniferous. Figd. Seward A.C. & Holthorn R.E in Tertiary. Post Tertiary Geology of Mull 1924 pl 72, fig. 5a, 5b. |
| Date taken: | Wed Jan 01 00:00:00 GMT 2003 |
| Photographer: | Unknown |
| Copyright statement: | NERC |
| Orientation: | Portrait |
| Size: | 311.71 KB; 665 x 1000 pixels; 56 x 85 mm (print at 300 DPI); 176 x 265 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images |
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