Tags: Fern.
Tietea singularis was a Marattialean tree fern from the Late Carboniferous–Permian which grew up to 12m in height. It is estimated to represent close to 90% of some fossil assemblages in Brazil.Tietea singularis stems usually are less than 20 cm in diameter bearing four orthostichies of leaves in a decussate arrangement. The stem is surrounded by a continuous ring of sclerenchyma that separates it from the root mantle. T.
