Examples of Psilopsida are:

Explanation

Psilotum belongs to Psilopsida. Psilotum belongs to Psilopsida. Psilotum is a genus of fern-like vascular plants. It is one of two genera in the family Psilotaceae commonly known as whisk ferns. They are generally referred to as whisk ferns, due to their resemblance to whiskbrooms. Whisk ferns are unique in that they lack true roots but instead possess underground stems known as rhizomes, which possess rhizoids for anchorage.