This moss can be commonly found in open, inorganic, acidic soil of disturbed banks and trail margins, and along water courses.
This species forms various looking turfs. They are small and dark-green to wine-red colored and rigid.
O. aligerum has divergent leaves when humid and imbricate ( leaves lying close to the stem, pointing toward the apex) when dry. They are lanceolate, slightly sheathing at the base, and have rigid-like lamellae that are found on both surfaces of the leaf.
Here is a closer look at the slightly wavy lamellae of O. aligerum.
The perigonial plants tend to be in separate colonies. Perigonial leaves are usually triangular-ovate and form rosettes, which function as a splash-cup mechanism to aid in the sperm dispersal.
The sporophytes of O. aligerum are dark brown when they are mature.
The seta of this species is straight and reddish-brown.