The pileus is radially rimose or rimulose, never squarrulose and rarely squamulose. The pileus is radially rimose or can be squamulose to squarrose. Placidium is a genus of crustose to squamulose to almost foliose lichens. Squamulose lichens may appear where the edges lift up. Some species can form marginal lobes and appear squamulose. In the field, it has a brownish, fibrillose/squamulose cap, which turns red when bruised. Examples of squamulose lichen include "Vahliella leucophaea", "Cladonia subcervicornis" and "Lichenomphalia hudsoniana". They can be identified by their characteristic Squamulose morphology with distinctive "fairy cups". Crustose and squamulose lichens have an upper cortex, but do not have a lower cortex. When the edges of the areolas lift up from the substrate, it is called squamulose.