| Placynthium | |
|---|---|
| Placynthium nigrum | |
| Scientific classification | |
| Kingdom: | Fungi |
| Division: | Ascomycota |
| Class: | Lecanoromycetes |
| Order: | Peltigerales |
| Family: | Placynthiaceae |
| Genus: | Placynthium (Ach.) Gray (1821) |
| Type species | |
| Placynthium nigrum (Huds.) Gray (1821) | |
| Synonyms | |
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Placynthium is a genus of lichen-forming fungi in the family Placynthiaceae. Members of this genus are commonly called blackthread lichens.