The lower part of the stem has small, narrow triangular leaves.

Capsules are 5mm long, with a lid that narrows abruptly into a short point.

[2] Swan's-neck thyme-moss is native to Europe and eastern North America.

It is found on the ground, logs, rocks, tree bases and along streams.

[3] In 2012, researchers in Serbia found that Mnium hornum could be used as a potential source of arachidonic acid.