Ptychostomum is a genus of mosses belonging to the family Bryaceae.

It has an almost cosmopolitan distribution.

[1] It has two subgenera, Psychostomum (Ptychostomum) and Psychostomum (Cladodium).

[2][3] The following species are recognised in the genus Ptychostomum:[1][4][5]

This Bryidae-related article is a stub.