Placidium

Placidium
Placidium lacinulatum
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

References

  1. ↑ Lumbsch TH, Huhndorf SM. (December 2007). "Outline of Ascomycota – 2007". Myconet. Chicago, USA: The Field Museum, Department of Botany. 13: 1–58.
  2. 1 2 3 4 5 Field Guide to California Lichens, Stephen Sharnoff, Yale University Press, 2014, ISBN 978-0-300-19500-2


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