The stem of Psilophyton, a representative of Psilopsida, is divided into an underground rhizome and an above-ground section. How are both parts branched?

Explanation

Psilophyton stems exhibit dichotomous branching, meaning they repeatedly split into two equal parts. This pattern is characteristic of Psilopsida, distinguishing it from other types of branching such as isotomous (equal forked), trichotomous (three branches), or multichotomous (many branches).