Period: Mid Carboniferous-Permian Period. 359-252 million years ago.
Notes: Originally, Psaronius was a name for the petrified stems, but today the genus is used for the entire tree fern. An unusual feature is that Psaronius did not have a true trunk, but had a massive root mantle formed by hundreds of rootlets. Psaronius is included in the fern family Marattiaceae. Living representatives of this family include many large ferns but none are a "tree form". Molecular studies indicate that this group of ferns have a very old lineage and may be a sister group to the horsetails Equisetum. Modern tree ferns have many similarities to Psaronius but are in a younger fern family, the Cyatheales.
There are 16 models in this set:
5x Standard. Fully mature and in good health. Useable in most scenes.
5x Health. Thriving, distressed, unhealthy, dying, dead.
6x Maturity. Ancient, young, growing, immature, forming, fiddleheads.
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