Claim: Kenrick and Crane's Polysporangiophyte cladograms have been questions before; besides, there appears to be no complete Linnean classification for early polysporangiophytes that is consistent with their cladistic analysis and subsequent research.
Evidence: Kenrick and Crane's cladograms have been questioned – see the Evolution section below. As of February 2011, there appears to be no complete Linnean (i.e., rank-based) classification for early polysporangiophytes that is consistent with Kenrick and Crane's cladistic analysis and subsequent research, though Cantino et al.