TY - JOUR T1 - Morphology and Wall Ultrastructure of the Devonian Spore Acinosporites macrospinosus Richardson 1965 and Its Bearing on the Origin of the Megaspore Apical Prominence JO - International Journal of Plant Sciences PY - 2022/05/24 AU - Wellman CH ED - DO - DOI: 10.1086/720388 SP - 000 EP - 000 Y2 - 2025/07/05 ER -