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Flavoplaca arcis - Wikipedia

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Flavoplaca arcis

Scientific classification
Domain:	Eukaryota
Kingdom:	Fungi
Division:	Ascomycota
Class:	Lecanoromycetes
Order:	Teloschistales
Family:	Teloschistaceae
Genus:	Flavoplaca
Species:	F. arcis
Binomial name
*Flavoplaca arcis* (Poelt & Vězda) Arup, Frödén & Søchting (2013)
Synonyms^[1]
Caloplaca arcis (Poelt & Vězda) Arup (2006) Caloplaca chlorina var. arcis Poelt & Vězda (1990) Caloplaca citrina var. arcis Poelt & Vězda (1990)

Flavoplaca arcis is a species of saxicolous (rock-dwelling), crustose to squamulose (scaley) lichen in the family Teloschistaceae.^[2] Although widely distributed in Northern, Central, and Western Europe, it is not commonly encountered.

Taxonomy

The species was first scientifically described by lichenologists Josef Poelt and Antonín Vězda in 2006, as a member of genus Caloplaca.^[3] Ulf Arup and colleagues transferred the taxon to the genus Flavoplaca in 2013, following a molecular phylogenetics-based restructuring of the family Teloschistaceae.^[4]

Description

Flavoplaca arcis features a crustose to slightly squamulose (scale-like) thallus with a bright yellow colour. The thallus is made up of wavy areoles (small, discrete areas), sometimes arranged in a rosette-shaped, that can be wavy with minute lobes around their periphery. These areoles are rather thick, ranging in diameter from 0.4 to 2 mm, and some are adorned with coarse, spherical reproductive structures known as blastidia, which match the colour of the thallus. These blastidia are distributed across the surface and edges of the areoles, with a particularly heavy concentration at the centres of the thalli.^[5]

Reproductive structures known as apothecia are zeorine in form (with a disc that is surrounded by a pale thalline margin, which has both algal and fungal cells), adnate (attached flatly) to sessile, yellow, and between 0.3 and 1.5 mm in width. When tested with a solution of potassium hydroxide (the K spot test), the thallus shows a purple reaction, which is a diagnostic feature for identification.^[5]

Habitat and distribution

Flavoplaca arcis is found across a wide range of localities in Europe, although it is not commonly reported. Its distribution spans Western and Central Europe, Scandinavia, the Mediterranean region, the Balkan Peninsula, and the Canary Islands. This species has an affinity for both silicate and calcareous rocks and stones. Beyond natural habitats, Flavoplaca arcis is also known to colonise man-made structures. It is typically found in locations that are relatively exposed to the elements and can be found on both vertical and horizontal surfaces.^[5]

References

^ "Synonymy. Current Name: Flavoplaca arcis (Poelt & Vězda) Arup, Frödén & Søchting, Nordic Jl Bot. 31(1): 44 (2013)". Species Fungorum. Retrieved 1 November 2023.
^ "Flavoplaca arcis (Poelt & Vězda) Arup, Frödén & Søchting". Catalogue of Life. Species 2000: Leiden, the Netherlands. Retrieved 1 November 2023.
^ Arup, U. (2006). "A new taxonomy of the Caloplaca citrina group in the Nordic countries, except Iceland". The Lichenologist. 38 (1): 1–20. doi:10.1017/S0024282905005402. S2CID 84537184.
^ Arup, Ulf; Søchting, Ulrik; Frödén, Patrik (2013). "A new taxonomy of the family Teloschistaceae". Nordic Journal of Botany. 31 (1): 16–83. doi:10.1111/j.1756-1051.2013.00062.x.
^ ^a ^b ^c Kossowska, Maria; Kubiak, Dariusz; Kowalewska, Agnieszka; Fałtynowicz, Wiesław; Kukwa, Martin (2022). "Five lichen species new to Poland". Folia Cryptogamica Estonica. 59: 3–10. doi:10.12697/fce.2022.59.02.

Taxon identifiers
Flavoplaca arcis	Wikidata: Q25637579 Wikispecies: Flavoplaca arcis CoL: 6J9B8 GBIF: 7786439 iNaturalist: 1232371 IndexFungorum: 802059 MycoBank: 802059 NBN: NHMSYS0020990207 Observation.org: 18471 Open Tree of Life: 5314110 SpeciesFungorum: 802059
Caloplaca citrina var. arcis	Wikidata: Q59462328 GBIF: 3430206 IndexFungorum: 356247 MycoBank: 356247 SpeciesFungorum: 356247

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