Orthothecium is a genus of mosses belonging to the family Hypnaceae.

The species of this genus are found in Eurasia, New Zealand and Northern America.

Species:

• Orthothecium acuminatum Bryhn, 1907
• Orthothecium austrocatenulatum Kindberg, 1891
• Orthothecium bollei (De Not.) A. Jaeger
• Orthothecium celebesiae (Müll. Hal.) A. Jaeger
• Orthothecium chryseum (Schwägr.) Schimp.
• Orthothecium diminutivum (Grout) H.A. Crum, Steere & L.E. Anderson
• Orthothecium duriaei (Mont.) Besch.
• Orthothecium filum (Müll. Hal.) Kindb.
• Orthothecium hyalopiliferum Redf. & B.H. Allen
• Orthothecium intricatum (Hartm.) Schimp.
• Orthothecium lapponicum (Schimp.) C. Hartm.
• Orthothecium nilgheriense (Mont.) A. Jaeger
• Orthothecium ovicarpum (Dixon) W.R. Buck
• Orthothecium rufescens (Dicks. ex Brid.) Schimp.
• Orthothecium schlagintweitii (Sendtn. ex Müll. Hal.) Paris
• Orthothecium strictum Lorentz
• Orthothecium trichophyllum (Sw. ex Hedw.) M. Fleisch.

...