TY - JOUR T1 - Polyspermophyllum, a New Permian Gymnosperm form Argentina, with Considerations about the Dicranophyllales JF - Review of Palaeobotany and Palynology Y1 - 1990 A1 - Archangelsky, Sergio A1 - Cúneo, Rubén SP - 117 EP - 135 VL - 63 ER -