| Name | Placidium A. Massalongo |
| Authorship | A. Massalongo |
| Rank | Genus |
| NomenclaturalStatus | NomLeg |
| Placed in | Verrucariaceae |
| Contains | Placidium arboreum (Schweinitz ex E. Michener) Lendemer Placidium hepaticum (Acharius) Arnold Placidium lachneum (Acharius) B. de Lesdain Placidium lacinulatum (Acharius) Breuss Placidium michelii A. Massalongo Placidium sp. Placidium squamulosum (Acharius) Breuss Placidium tuckermanii (Ravenel ex Montagne) Breuss |
| Citation | 1855 Symm. Lich. Nov. 75 |
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