Calcareous limy seeps.
Tentative ID. Maybe Fissidens subbasilaris?
Osceola National Forest (Big Gum Swamp Wilderness), Columbia County, FL
we saw this elsewhere, not far away, forming the same sporophytes. But feel free to correct the ID. In a very large open bog.
Species is a guess by the algorithm, so please give feedback. Apologies for imperfect focus. Sun too bright to see the screen!