Wynne, F. E. 1944. Studies in Drepanocladus . Stem leaves acuminate to longly acuminate, with denticulate to strongly denticulate margins above. Endostome reduced, irregularly perforated in all parts. Inner perichaetial leaves suddenly narrowed to acute or shortly acuminate apex, with margins strongly denticulate to dentate above.
Stem leaves longly to very longly acuminate, with slightly denticulate to denticulate margins above.
Endostome perfect or reduced, perforated only along mid-line of processes. Inner perichaetial leaves gradually narrowed to longly acuminate apex, with margins finely denticulate to denticulate above. Supra-alar cells of stem leaves slightly or strongly incrassate, porose, forming a group equal in size to or larger than the alar cell group. Stem leaf costa mostly in the bottom of a deep, in transverse section narrow-angled fold. S. orthothecioides 2.