Anatomically preserved stem from the Carboniferous of Gondwana: Phyllocladopitys petriellae sp. nov.
BREA, M.; CÉSARI, S.
REVIEW OF PALAEOBOTANY AND PALYNOLOGY
ELSEVIER SCIENCE BV
Lugar: Amsterdam; Año: 1995 vol. 86 p. 315 - 323
Phyllocladopitys petriellae Brea and Ctsari, sp. nov. occurs in the early Late Carboniferous Jejenes Formation, Argentina. The description of the taxon is based on one anatomically preserved stem, a few centimeters in diameter. The primary xylem is mesarch. The secondary xylem shows only inconspicuous growth rings. Pitting on the walls of the tracheids is bordered. Rays are low, uni- or biseriate. Two to four simple pits are present in the cross fields. Comparisons are made with early gymnosperms and Cordaitales and paleoclimatic evidence is analyzed.