''Zeroviella'' is a genus 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.fungi in the subfamily Xanthorioideae of 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 has eight saxicolous (rock-dwelling) species. ''Zeroviella'' was segregated from ''

Rusavskia ''Rusavskia'' is a genus of lichen-forming fungi in the family Teloschistaceae. It has 12 species. It is a member of the subfamily Xanthorioideae. The thallus of ''Rusavskia'' is characterized by its foliose lichen, foliose (leaf-like) structu ...

'', a closely related genus, in 2015.

Taxonomy

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 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 ...

and Jae-Seoun Hur in 2015, to contain the species complex centred around ''Rusavskia papillifera''. Accordingly, ''

Zeroviella papillifera ''Zeroviella'' is a genus of lichen-forming fungi in the subfamily Xanthorioideae of the family Teloschistaceae. It has eight saxicolous (rock-dwelling) species. ''Zeroviella'' was segregated from '' Rusavskia'', a closely related genus, in 2015 ...

'' was assigned as the type species of the genus. According to their phylogenetic analysis, these species formed a

monophyletic In cladistics for a group of organisms, monophyly is the condition of being a clade—that is, a group of taxa composed only of a common ancestor (or more precisely an ancestral population) and all of its lineal descendants. Monophyletic gro ...

branch, warranting distinction as a new genus. Members of the genus ''Zeroviella'' exhibit distinct differences from those of the genus ''

''. Notably, ''Zeroviella'' has cortical layers throughout the thallus, in contrast to ''Rusavskia'', which primarily features tissue with only a slight paraplectenchymatous layer. Additionally, the s of ''Zeroviella'' are noticeably thinner, attributed to the absence of a well-developed hollow in the medulla. This genus also typically displays pronounced

pseudocyphella Pseudocyphellae (singular ''pseudocyphella'') are structures in lichens that appear as tiny pores on the outer surface (the cortex of the lichen. They are caused when there is a break in the cortex of the lichen, and the medullary hyphae extend t ...

e (pores on the cortex). While ''Zeroviella'' lobes appear convex due to their downward-bending edges, those of ''Rusavskia'' are extremely convex with a prominent hollow medulla. Geographically, ''Zeroviella'' is mainly found in Mediterranean and Eastern Eurasian regions, whereas ''Rusavskia'' has a bipolar distribution (i.e., occurring at both polar regions) and is present at high altitudes across all continents. Phylogenetic analyses further distinguish the two, with ''Zeroviella'' positioned on a separate monophyletic branch. The genus name honours Ukrainian botanist Dmytro K. Zerov (1895–1971), "to acknowledge his contributions, especially to the Eurasian flora of liverworts and sphagnous mosses."

Description

''Zeroviella'' has a foliose form and tends to grow on rocks. The thallus, or main body of the lichen, presents in vibrant shades ranging from yellow and orange to a deeper reddish-orange. It adheres firmly to its , attaching from its lower side. Its layers have a texture, while its

medullary Medulla or Medullary may refer to: Science * Medulla oblongata, a part of the brain stem * Renal medulla, a part of the kidney * Adrenal medulla, a part of the adrenal gland * Medulla of ovary, a stroma in the center of the ovary * Medulla of ...

layer lacks a prominently developed cavity. The (reproductive structures) of ''Zeroviella'' are of the / type, with a that is in nature. When it comes to the reproductive , they manifest as narrowly elongated and rod-shaped (). Chemically, ''Zeroviella'' contains a dominant compound known as parietin, but the genus also contains other substances like

teloschistin Fallacinol (teloschistin) is an organic compound in the structural class of chemicals known as anthraquinones. It is found in some lichens, particularly in the family Teloschistaceae, as well as a couple of plants and non lichen-forming fungi. In ...

fallacinal Fallacinal is an organic compound in the structural class of chemicals known as anthraquinones. It is found in many species of the lichen family Teloschistaceae. History In 1936, Japanese chemists Mitizo Asano and Sinobu Fuziwara reported on the ...

, and

parietinic acid Parietinic acid is an organic compound in the structural class of chemicals known as anthraquinones. It is found in many species of the lichen family Teloschistaceae. The substance was first reported in the literature by the German chemist Walter ...

; traces of emodin are present as well.

Habitat and distribution

The lichen genus ''Zeroviella'' thrives predominantly in coastal areas, often colonising large siliceous boulders. It can be found on both more or less vertical and horizontal rock surfaces that are sun-exposed. Beyond the coasts, ''Zeroviella'' extends to high-altitude mountainous regions, with a particular preference for areas featuring limestone outcrops. The genus comprises eight species. Among these, ''Zeroviella papillifera'' is the most widespread. While ''Z. mandschurica'' and ''Z. esfahanensis'' are commonly found across the Asian continent, species like ''Z. coreana'', ''Z. digitata'', and ''Z. ussurica'' have a more limited range. ''Z. laxa'' was reported as new to Pakistan in 2021. In terms of its broader geographical spread, ''Zeroviella'' predominantly populates the

Palearctic The Palearctic or Palaearctic is the largest of the eight biogeographic realms of the Earth. It stretches across all of Eurasia north of the foothills of the Himalayas, and North Africa. The realm consists of several bioregions: the Euro-Sibe ...

region, encompassing Europe, Asia, and North Africa. Although there are a few reports of ''Zeroviella papillifera'' being found in North America, these records require further verification.

Species

, Species Fungorum (in the Catalogue of life) accepts eight species of ''Zeroviella''. * ''

Zeroviella coreana ''Zeroviella'' is a genus of lichen-forming fungi in the subfamily Xanthorioideae of the family Teloschistaceae. It has eight saxicolous (rock-dwelling) species. ''Zeroviella'' was segregated from ''Rusavskia'', a closely related genus, in 2015 ...

'' * '' Zeroviella digitata'' * '' Zeroviella domogledensis'' * ''

Zeroviella esfahanensis ''Zeroviella esfahanensis'' is a species of saxicolous (rock-dwelling) foliose lichen in the family Teloschistaceae. It is found in various locations across the Palearctic realm, having been recorded in Europe, Asia, and North Africa, where i ...

'' * '' Zeroviella laxa'' * ''

Zeroviella mandschurica ''Zeroviella'' is a genus of lichen-forming fungi in the subfamily Xanthorioideae of the family Teloschistaceae. It has eight saxicolous (rock-dwelling) species. ''Zeroviella'' was segregated from ''Rusavskia'', a closely related genus, in 20 ...

'' * ''

'' * '' Zeroviella ussurica''

References

{{Taxonbar, from=Q61980410 Teloschistales Teloschistales genera Lichen genera Taxa described in 2015 Taxa named by Sergey Kondratyuk Taxa named by Jae-Seoun Hur