Serrulacaulis was a genus of early land plant with branching axes. Known fossils are of Late Devonian age (382 to 359 million years ago). A cladogram published in 2004 by Crane et al. places Serrulacaulis in the core of a paraphyletic stem group of broadly defined "zosterophylls", basal to the lycopsids (living and extinct clubmosses and relatives).
References
External links Cladogram from Crane, Herendeen & Friis 2004