''Olegblumia'' is a
monotypic fungal
genus in the family
Teloschistaceae
The Teloschistaceae are a large family of mostly lichen-forming fungi belonging to the class Lecanoromycetes in the division Ascomycota. The family, estimated to contain over 1800 species, was extensively revised in 2013, including the creation o ...
.
It contains the single species ''Olegblumia demissa'', a
saxicolous (rock-dwelling)
crustose lichen.
Taxonomy
Genus ''Olegblumia'' was first
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 2015 by lichenologists
Sergey Kondratyuk
Sergey Yakovlevich Kondratyuk ( uk, Сергій Якович Кондратюк) (born 17 May 1959) is a Ukrainian botanist specialising in lichenology. His research deals with the taxonomy, floristics, ecology and geography of lichens and lic ...
, Laszlo Lőkös, and Jae-Seoun Hur.
However, the name was not
validly published according to the rules of botanical nomenclature as set out in the
.
The name was validly published by the same authors in 2020.
The genus name honours Ukrainian lichenologist Oleg Blum.
In
molecular phylogenetic
Molecular phylogenetics () is the branch of phylogeny that analyzes genetic, hereditary molecular differences, predominantly in DNA sequences, to gain information on an organism's evolutionary relationships. From these analyses, it is possible to ...
analysis, ''Olegblumia'' is a
sister group
In phylogenetics, a sister group or sister taxon, also called an adelphotaxon, comprises the closest relative(s) of another given unit in an evolutionary tree.
Definition
The expression is most easily illustrated by a cladogram:
Taxon A and t ...
to the genus ''
Usnochroma
''Usnochroma'' is a genus of lichen-forming fungi in the family Teloschistaceae. It has two species of crustose lichens. The genus was circumscribed in 2013 by lichenologists Ulrik Søchting, Ulf Arup, and Patrik Frödén, with ''Usnochroma carp ...
''.
Description
Genus ''Olegblumia'' is characterized by a thallus that typically forms a distinct,
rosette-like shape. The colour of the upper surface of the lichen ranges from brown to brownish-grey. Its are flat to slightly convex and are quite narrow.
Soralia
Soredia are common reproductive structures of lichens. Lichens reproduce asexually by employing simple fragmentation and production of soredia and isidia. Soredia are powdery propagules composed of fungal hyphae wrapped around cyanobacteria o ...
, the reproductive structures where are produced, are found on the surface and are noteworthy for their convex shape and highly uplifted soredious mass, which bears a brownish hue. The soredia themselves are irregularly rounded with a colouration that varies from brown to brownish-green. Chemically, ''Olegblumia'' contains the
lichen products
vicanicin and
caloploicin.
Habitat and distribution
Found in Europe and North America, ''Olegblumia demissa'' grows on
siliceous rock
Siliceous rocks are sedimentary rocks that have silica (SiO2) as the principal constituent. The most common siliceous rock is chert; other types include diatomite. They commonly form from silica-secreting organisms such as radiolarians, diatoms, or ...
s, typically on vertical and inclined surfaces. ''
Aspicilia contorta
''Aspicilia'' (sunken disk lichen) is a genus of mostly crustose areolate lichens that grow on rock. Most members have black apothecia discs that are slightly immersed in the areolas, hence the common name.Field Guide to California Lichens, Ste ...
'' is a frequent lichen associate.
References
{{Taxonbar, from=Q107289169 , from2=Q10440457, from3=Q49449535
Teloschistales
Teloschistales genera
Monotypic Lecanoromycetes genera
Lichen genera
Taxa described in 2020
Taxa named by Sergey Kondratyuk
Taxa named by Jae-Seoun Hur
Taxa named by László Sándor Lőkös