''Thelidium'' 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.fungi A fungus ( : fungi or funguses) is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms. These organisms are classified as a kingdom, separately from ...

in the family

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 ...

in 1855 by Italian lichenologist

Abramo Bartolommeo Massalongo Abramo Bartolommeo Massalongo (13 May 1824 – 25 May 1860) was an Italian paleobotanist and lichenologist. He was born in Tregnago in the Province of Verona and took a great interest in botany as a young man. Massalongo joined the faculty of med ...

, who assigned ''

Thelidium amylaceum ''Thelidium'' is a genus of lichen-forming fungi in the family Verrucariaceae. The genus was circumscribed in 1855 by Italian lichenologist Abramo Bartolommeo Massalongo, who assigned '' Thelidium amylaceum'' as the type species. Species *'' The ...

'' 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

*''

'' *'' Thelidium carbonaceum'' – Australia *'' Thelidium chibaense'' – Japan *'' Thelidium decipiens'' *'' Thelidium fontigenum'' *'' Thelidium fumidum'' *'' Thelidium heardense'' *'' Thelidium helveticum'' *'' Thelidium impressum'' *''

Thelidium incavatum ''Thelidium'' is a genus of lichen-forming fungi in the family Verrucariaceae. The genus was circumscribed in 1855 by Italian lichenologist Abramo Bartolommeo Massalongo, who assigned ''Thelidium amylaceum'' as the type species. Species *''Theli ...

'' *''

Thelidium izuense ''Thelidium'' is a genus of lichen-forming fungi in the family Verrucariaceae. The genus was circumscribed in 1855 by Italian lichenologist Abramo Bartolommeo Massalongo, who assigned ''Thelidium amylaceum'' as the type species. Species *''Theli ...

'' – Japan *''

Thelidium litorale ''Thelidium'' is a genus of lichen-forming fungi in the family Verrucariaceae. The genus was circumscribed in 1855 by Italian lichenologist Abramo Bartolommeo Massalongo, who assigned '' Thelidium amylaceum'' as the type species In zoological n ...

'' *''

Thelidium luchunense ''Thelidium'' is a genus of lichen-forming fungi in the family Verrucariaceae. The genus was circumscribed in 1855 by Italian lichenologist Abramo Bartolommeo Massalongo, who assigned ''Thelidium amylaceum'' as the type species. Species *''Theli ...

'' – China *''

Thelidium methorium ''Thelidium'' is a genus of lichen-forming fungi in the family Verrucariaceae. The genus was circumscribed in 1855 by Italian lichenologist Abramo Bartolommeo Massalongo, who assigned ''Thelidium amylaceum'' as the type species. Species *''Theli ...

'' *'' Thelidium minimum'' *'' Thelidium minutulum'' *'' Thelidium nylanderi'' *'' Thelidium papulare'' *'' Thelidium pluvium'' – Europe *'' Thelidium praevalescens'' *'' Thelidium pyrenophorellum'' *'' Thelidium pyrenophorum'' *'' Thelidium rimosulum'' – Europe *'' Thelidium robustum'' *'' Thelidium sinense'' – China *'' Thelidium uvidulum'' – Nepal *'' Thelidium yunnanum'' – China *'' Thelidium zwackhii''

References

Verrucariales Lichen genera Taxa described in 1855 Taxa named by Abramo Bartolommeo Massalongo {{Eurotiomycetes-stub