Placidium
| Placidium | |
|---|---|
| Scientific classification | |
| Kingdom: | Fungi |
| Division: | Ascomycota |
| Class: | Eurotiomycetes |
| Subclass: | Chaetothyriomycetidae |
| Order: | Verrucariales |
| Family: | Verrucariaceae |
| Genus: | Placidium A. Massal. |
Placidium is a genus of crustose to squamulose to almost foliose lichens. The genus is in the Verrucariaceae family.[1] Most members grow on soil (are terricolous), but some grow on rock (saxicolous).[2] The fruiting bodies are perithecia, flask-like structures immersed in the lichen body (thallus) with only the top opening visible, dotting the thallus.[2]
Members of the genus are commonly called stiplescale lichens or earthscale.[2]:327
Lichen spot tests are all negative.[2]
Members of the genus lack rhizenes, but otherwise resemble members of the genus Claviscidium.[2]
Species
- Placidium acarosporoides
- Placidium arboretum
- Placidium lachneum
- Placidium squamulosum