Plagiomnium cuspidatum, also known as toothed or “baby-tooth” plagiomnium moss and woodsy thyme-moss, is a species of thyme-moss that originated in North America, but can now also be found throughout Middle America, Africa, Northern and Southern Asia (excluding China), and Europe.

[5] P. cuspidatum is often characterized as a small moss with shoots ranging from 1.5-4 cm tall and leaves roughly around 3 mm long.

[5] Leaf margins are sharply toothed and are absent in the lower half of the leaves while the midrib is obvious.

It is widely distributed throughout North America and Europe, but is less commonly found in Africa and Eastern Asia.

[13] Located at the bottom of the mosses, the rhizomes are used by the salamanders to attach their eggs to, which aids in stabilization.

[13] It can be used as a planting medium in bioactive terrariums, aquariums, and paludariums too due to its anti-microbial and antifungal properties.

[7] Its ability to retain high humidity levels and grow in mats or carpets, which provides great cover for the tank's "clean-up crew", also make it perfect for the hobby.