Amblystegium serpens, the creeping feathermoss, is a species of moss. Its range includes Britain, where it is a common species. Creeping feather-moss is pleurocarpous in form, with ovate to lanceolate leaves which end in a fine acute point. It forms creeping mats on decaying tree stumps, hedgebanks and other shaded sites. It can live under water, and is used as a plant in some home aquariums.