''Orcularia'' 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 ...

of four species of

lichen A lichen ( , ) is a composite organism that arises from algae or cyanobacteria living among filaments of multiple fungi species in a mutualistic relationship.Caliciaceae The Caliciaceae are a family of mostly lichen-forming fungi belonging to the class Lecanoromycetes in the division Ascomycota. Although the family has had its classification changed several times throughout its taxonomic history, the use of mode ...

. It was originally

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 ...

as a

section Section, Sectioning or Sectioned may refer to: Arts, entertainment and media * Section (music), a complete, but not independent, musical idea * Section (typography), a subdivision, especially of a chapter, in books and documents ** Section sign ...

of the genus ''

Rinodina ''Rinodina'' is a genus of lichen-forming fungi in the family Physciaceae. The genus has a widespread distribution and contains about 265 species. It is hypothesized that a few saxicolous lichen, saxicolous species common to dry regions of wester ...

'' by Swedish botanist

Gustaf Oskar Andersson Malme Gustaf Oskar Andersson Malme (24 October 1864, Stora Malm in Södermanland County – 5 March 1937) was a Swedish botanist. He studied at Uppsala University, earning his PhD in 1892. From 1895 - 1905, he was a curator at the Swedish Museum ...

in 1902.

Klaus Kalb Klaus Kalb (born 1942) is a German lichenologist and an authority on tropical lichens. Biography Klaus Kalb was born in Nuremberg in 1942 and grew up in southern Bavaria. From 1960 to 1965 he studied biology, chemistry, and geography at t ...

and Mireia Giralt promoted it to generic status in 2011. ''Orcularia'' is characterized by the presence of

ascospore An ascus (; ) is the sexual spore-bearing cell produced in ascomycete fungi. Each ascus usually contains eight ascospores (or octad), produced by meiosis followed, in most species, by a mitotic cell division. However, asci in some genera or s ...

s that develop in such a way that the

septum In biology, a septum (Latin for ''something that encloses''; plural septa) is a wall, dividing a cavity or structure into smaller ones. A cavity or structure divided in this way may be referred to as septate. Examples Human anatomy * Interatri ...

is inserted after lateral wall thickenings become distinct, and also by threadlike (filiform)

conidia A conidium ( ; ), sometimes termed an asexual chlamydospore or chlamydoconidium (), is an asexual, non-motile spore of a fungus. The word ''conidium'' comes from the Ancient Greek word for dust, ('). They are also called mitospores due to the ...

Species

*'' Orcularia elixii'' (2011) *'' Orcularia insperata'' (2011) *'' Orcularia placodiomorpha'' (2011) *'' Orcularia placodiomorphoides'' (2011)

References

Caliciales Lichen genera Taxa described in 1902 Caliciales genera Taxa named by Gustaf Oskar Andersson Malme {{Caliciales-stub