Placidium

Placidium
Placidium arboreum
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Fungi
Division: Ascomycota
Class: Eurotiomycetes
Order: Verrucariales
Family: Verrucariaceae
Genus: Placidium
A.Massal. (1855)
Type species
Placidium michelii
A.Massal. (1856)

Placidium is a genus of crustose to squamulose to almost foliose lichens. The genus is in the family Verrucariaceae.[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. Lichen spot tests are all negative. Members of the genus lack rhizines, but otherwise resemble members of the genus Clavascidium.[2]

Members of the genus are commonly called stiplescale lichens or earthscale.[2]: 327 

  1. ^ Cite error: The named reference Wijayawardene et al. 2022 was invoked but never defined (see the help page).
  2. ^ a b c Field Guide to California Lichens, Stephen Sharnoff, Yale University Press, 2014, ISBN 978-0-300-19500-2