| Name | Placynthium |
| Authorship | |
| Rank | Genus |
| NomenclaturalStatus | NomLeg |
| Placed in | Pyrenopsidaceae |
| Contains | Placynthium asperellum (Acharius) Trevisan Placynthium flabellosum (Tuckerman) Zahlbruckner Placynthium microphyllizum (Nylander ex Hasse) Hasse Placynthium nigrum (Hudson) Gray Placynthium petersii (Nylander) Burnham Placynthium sp. Placynthium subnigrum B. de Lesdain |