Post by paleoflor on Mar 22, 2011 13:23:10 GMT -5
Probably most people interested in fossil plants, or ferns more in particular, have heard about the tree fern Psaronius. For those who haven't, check out this web-page:
www.xs4all.nl/~steurh/engpsar/epsaron.html
However, it is not the only tree-fern in the Marattiales order. The photo below shows a specimen of Tietea singularis (Solms-Laubach) Herbst, 1986. Tietea occurs in the Permian of Brazil as structurally perserved, permineralised stems. It can be distinguished from Psaronius by the arrangement of the vascular bundles. In Tietea, they are arranged irregularly or show a weak cyclic organization and are usually less than 20cm in diameter. The stem is separated from the root mantle by a continuous sheath of sclerenchyma. Tietea is considered to have been a major component in some of the Permian plant assemblages in South America.
www.xs4all.nl/~steurh/engpsar/epsaron.html
However, it is not the only tree-fern in the Marattiales order. The photo below shows a specimen of Tietea singularis (Solms-Laubach) Herbst, 1986. Tietea occurs in the Permian of Brazil as structurally perserved, permineralised stems. It can be distinguished from Psaronius by the arrangement of the vascular bundles. In Tietea, they are arranged irregularly or show a weak cyclic organization and are usually less than 20cm in diameter. The stem is separated from the root mantle by a continuous sheath of sclerenchyma. Tietea is considered to have been a major component in some of the Permian plant assemblages in South America.
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