Squamulose lichens are composed of small scales attached to the substrate along one edge. The layered structure of the scale is similar to that of a foliose lichen, but their small scale means that their are either classified as a separate type or included with the crustose lichens.
Some of the Cladonia have a squamulose primary thallus, however the development of podetia tends to classify them as fruticose or intermediate forms.