Brevianthus J.J.Engel & R.M.Schust., Phytologia 47: 317. 1981.

Renner, Matt A. M., Engel, John J., Patzak, Simon D. F. & Heinrichs, Jochen, 2015, A new species of Brevianthus (Brevianthaceae, Marchantiophyta) from New Caledonia with unusual underleaf production, PhytoKeys 50, pp. 43-60 : 44-45

Brevianthus J.J.Engel & R.M.Schust., Phytologia 47: 317. 1981.

Type.

Brevianthus flavus (Grolle) J.J.Engel & R.M.Schust., Phytologia 47: 318. 1981.

Key to species

1	Leaf margins crenulate; leaves bifid at least on small stature shoots; leaf cell surface ornamentation lacking urceolate papillae over the cell junctions	2
-	Leaf margins entire, not crenulate; leaves undivided; leaf cell surface ornamentation with urceolate papillae over the cell junctions on the medial-basal cells of some or all leaves	Brevianthus flavus subsp. flavus
2	Small triangular underleaves present on small to medium-sized shoot sectors, absent from large shoots; leaf margin not hyaline; leaf apex always distinctly bifid; leaf margin crenulate by thickened cell walls, marginal cells similar in size to internal cells	Brevianthus hypocanthidium M.A.M.Renner & J.J.Engel
-	Underleaves entirely absent; leaf margin hyaline; leaf apex bifid on small leaves but undivided on large leaves, leaf margin crenulate by bulging cells, marginal cells smaller than internal cells	Brevianthus flavus subsp. crenulatus J.J.Engel