TY - JOUR T1 - Permanent dyads in sporangia and spore masses from the Lower Devonian of the Welsh Borderland JO - Botanical Journal of the Linnean Society PY - 1998/01/01 AU - Wellman CH AU - Edwards D AU - Axe L ED - DO - DOI: 10.1006/bojl.1998.0165 VL - 127 IS - 2 SP - 117 EP - 147 Y2 - 2025/03/13 ER -