Kenrick and Crane researched and made cladograms of Polysporangiophyte (also called polysporangiates or formally Polysporangiophyta) but received questions about their work.
Both the cladogram derived from Kenrick and Crane's studies and its implications for the evolution of land plants have been questioned by others. Polysporangiophytes, also called polysporangiates or formally Polysporangiophyta, are plants in which the spore-bearing generation (sporophyte) has branching stems (axes) that bear sporangia. The concept of the polysporangiophytes, more formally called Polysporangiophyta, was first published in 1997 by Kenrick and Crane. Research by Kenrick and Crane that established the polysporangiophytes concluded that none of Banks' three groups were monophyletic. Kenrick and Crane's cladograms have been questioned  see the Evolution section below. 
