Because they are morphologically simple, Psilotophyta (whisk ferns) have traditionally been thought to be a basal group in the radiation of land plants. Molecular phylogenies have challenged this hypothesis and support the alternative hypothesis that they________.

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Psilotophyta (whisk ferns) are considered to have lost complex structures in their lineage, according to molecular phylogenies, rather than being a basal group due to their morphological simplicity. This suggests a more derived position within the plant kingdom through the process of simplification from more complex ancestors.

Because They Are Morphologically Simple, Psilotophyta (Whisk Ferns) Have Traditionally