MACNBR   00242
MUSEO ARGENTINO DE CIENCIAS NATURALES "BERNARDINO RIVADAVIA"
Unidad Ejecutora - UE
artículos
Título:
Oligocene ferns from the Rancahué Formation (Aluminé, Neuquén, Argentina): Cuyenopteris patagoniensis gen. et sp. nov. (Polypodiales: Blechnaceae/Dryopteridaceae) and Alsophilocaulis calveloi Menéndez emend. (Cyatheales: Cyatheaceae)
Autor/es:
VERA, EZEQUIEL IGNACIO
Revista:
GEOBIOS
Editorial:
Elsevier
Referencias:
Lugar: Amsterdam; Año: 2009
ISSN:
0016-6995
Resumen:
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The study of abundant
permineralized fern remains collected in the Oligocene Rancahué
Formation (Neuquén Province, Argentina), allowed the identification
of two different taxa. The name Cuyenopteris patagoniensis gen. et
sp. nov. is proposed for several stems and fronds characterized by
the presence of caulinar dictyosteles with root gaps, producing
C-shaped leaf traces composed by two hippocampiform bundles flanked
by eight to ten small round bundles, half of them diverging from
cauline meristeles and the rest from the hippocampiform bundles. The
presence of these features, along with frond bases with adaxial
grooves and a pair of pneumatophores, suggest affinities with the
Blechnaceae or Dryopteridaceae. The second identified taxon is
Alsophilocaulis calveloi Menéndez. Based on features observed in
these new materials, including characteristics of the mantle of
adventitious roots and anatomy of the petiole bases, an emended
diagnosis for this latter species is proposed.