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- W2232969884 abstract "A large collection of anatomically preserved marattialean stem and trunk segments from the Upper Pennsylvanian of Ohio provides the basis for detailed structural and taxonomic studies of several Psaronius species. Nineteen of the specimens form an intergrading series from low levels of the stem to near the apex of a single species. Material previously described as Caulopteris magnifica, Psaronius lacunosis, and P. pertusus and several newly discovered specimens are described as Psaronius magnificus (Herzer) n. comb. The plant has helically-arranged leaves at all levels and exhibits large, vertically-elongated leaf scars near the apex. Trunk segments from proximal levels have up to a 10 cm thick zone of radially arranged bound roots with more peripheral free roots. Stems are 3.6-14.2 cm in diameter. Internally, the stems have 3-6 stelar cycles that are separated by aerenchymatous ground tissue, and bounded by a prominent peripheral sheath. The specimens of P. magnificus provide a basis for separating taxonomically significant features from differences that result from other factors, and demonstrate that some Psaronius species retained a loose helical leaf arrangement to the apex of the largest trees." @default.
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- W2232969884 date "1982-11-01" @default.
- W2232969884 modified "2023-10-01" @default.
- W2232969884 title "Psaronius magnificus n. comb., a marattialean fern from the Upper Pennsylvanian of North America; addendum" @default.
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