''Placidiopsis'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

lichen A lichen ( , ) is a composite organism that arises from algae or cyanobacteria living among filaments of multiple fungi species in a mutualistic relationship.Verrucariaceae The Verrucariaceae are a family of mostly lichenised fungi in the order Verrucariales. The lichen-forming species, which comprise the vast majority of the family, have a wide variety of thallus forms, and include crustose (crust-like), foliose ( ...

. The genus was

circumscribed In geometry, the circumscribed circle or circumcircle of a polygon is a circle that passes through all the vertices of the polygon. The center of this circle is called the circumcenter and its radius is called the circumradius. Not every polyg ...

by Italian naturalist

Francesco Beltramini de Casati Francesco, the Italian language, Italian (and original) version of the personal name "Francis (given name), Francis", is the List of most popular given names, most common given name among males in Italy. Notable persons with that name include: Pe ...

in 1858, with ''

Placidiopsis grappae ''Placidiopsis'' is a genus of lichens in the family Verrucariaceae. The genus was circumscribed by Italian naturalist Francesco Beltramini de Casati in 1858, with '' Placidiopsis grappae'' assigned as the type species. Species *'' Placidiops ...

'' assigned as the

type species In zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the species that contains the biological type specimen ...

Species

*'' Placidiopsis cinerascens'' *'' Placidiopsis cavicola'' *''

Placidiopsis cinereoides ''Placidiopsis'' is a genus of lichens in the family Verrucariaceae. The genus was circumscription (taxonomy), circumscribed by Italian naturalist Francesco Beltramini de Casati in 1858, with ''Placidiopsis grappae'' assigned as the type species. ...

'' *'' Placidiopsis crassa'' *'' Placidiopsis custnani'' *''

'' *''

Placidiopsis hamadicola ''Placidiopsis'' is a genus of lichens in the family Verrucariaceae. The genus was circumscribed by Italian naturalist Francesco Beltramini de Casati in 1858, with ''Placidiopsis grappae'' assigned as the type species. Species *'' Placidiopsi ...

'' *''

Placidiopsis hypothallina ''Placidiopsis'' is a genus of lichens in the family Verrucariaceae. The genus was circumscribed by Italian naturalist Francesco Beltramini de Casati in 1858, with '' Placidiopsis grappae'' assigned as the type species. Species *'' Placidiops ...

'' – Brazil *''

Placidiopsis minor ''Placidiopsis'' is a genus of lichens in the family Verrucariaceae. The genus was circumscribed by Italian naturalist Francesco Beltramini de Casati in 1858, with ''Placidiopsis grappae'' assigned as the type species. Species *'' Placidiopsis c ...

'' *'' Placidiopsis novozelandica'' *''

Placidiopsis oreades ''Placidiopsis'' is a genus of lichens in the family Verrucariaceae. The genus was circumscribed by Italian naturalist Francesco Beltramini de Casati in 1858, with '' Placidiopsis grappae'' assigned as the type species. Species *'' Placidiops ...

'' *''

Placidiopsis parva ''Placidiopsis'' is a genus of lichens in the family Verrucariaceae. The genus was circumscribed by Italian naturalist Francesco Beltramini de Casati in 1858, with '' Placidiopsis grappae'' assigned as the type species. Species *'' Placidiops ...

'' – Australia *''

Placidiopsis poronioides ''Placidiopsis'' is a genus of lichens in the family Verrucariaceae. The genus was circumscribed by Italian naturalist Francesco Beltramini de Casati in 1858, with '' Placidiopsis grappae'' assigned as the type species. Species *'' Placidiops ...

'' – Hong Kong *''

Placidiopsis pseudocinerea ''Placidiopsis'' is a genus of lichens in the family Verrucariaceae. The genus was circumscribed by Italian naturalist Francesco Beltramini de Casati in 1858, with '' Placidiopsis grappae'' assigned as the type species. Species *'' Placidiops ...

'' – Europe *''

Placidiopsis sbarbaronis ''Placidiopsis'' is a genus of lichens in the family Verrucariaceae. The genus was circumscribed by Italian naturalist Francesco Beltramini de Casati in 1858, with '' Placidiopsis grappae'' assigned as the type species. Species *'' Placidiops ...

'' *''

Placidiopsis tiroliensis ''Placidiopsis'' is a genus of lichens in the family Verrucariaceae. The genus was circumscription (taxonomy), circumscribed by Italian naturalist Francesco Beltramini de Casati in 1858, with ''Placidiopsis grappae'' assigned as the type species. ...

'' *''

Placidiopsis tominii ''Placidiopsis'' is a genus of lichens in the family Verrucariaceae. The genus was circumscribed by Italian naturalist Francesco Beltramini de Casati in 1858, with '' Placidiopsis grappae'' assigned as the type species In zoological nomencla ...

References

Verrucariales Lichen genera Eurotiomycetes genera Taxa described in 1858 {{Eurotiomycetes-stub