Rufoplaca arenaria (Pers.) Arup, Søchting & Frödén

Nord. J. Bot., 31: 74, 2013. Basionym: Lichen arenarius Pers. - Ann. Bot. (Usteri), 1: 27, 1794.
Synonyms: Blastenia arenaria (Pers.) A. Massal.; Blastenia lamprocheila (DC.) Arnold; Caloplaca arenaria (Pers.) Müll. Arg.; Caloplaca craspedia (Ach.) Szatala; Caloplaca ferruginascens (Nyl.) H. Olivier; Caloplaca lamprocheila (DC.) Flagey; Lecanora lamprocheila (DC.) Nyl.
Distribution: N - VG (Castello 2002, Martellos & Castello 2004), Frl (Tretiach & Hafellner 2000), Ven (Nascimbene 2005c, Nascimbene & Marini 2007), TAA (Caniglia & al. 2002, Nascimbene & al. 2022), Lomb (De Vita & Valcuvia 2004, Favero-Longo & al. 2023), Piem (Isocrono & al. 2003, 2004, Favero-Longo & al. 2006b, 2015, Isocrono & Ferrarese 2008, Isocrono & Piervittori 2008, Giordani & al. 2014, Gheza & Nascimbene 2024), VA (Piervittori & Isocrono 1999, Piervittori & al. 2001, 2004, Revel & al. 2001, Isocrono & al. 2008, Favero-Longo & Piervittori 2009, Matteucci & al. 2015c), Emil (Dalle Vedove & al. 2002, Fariselli & al. 2020), Lig (Loppi & al. 1997, Giordani & al. 2016). C - Tosc (Benesperi 2006, Lastrucci & al. 2009), Laz, Mol (Nimis & Tretiach 1999, Caporale & al. 2008), Sar (Nöske 2000, Rizzi & al. 2011, Giordani & al. 2013, Neuwirth 2018). S - Camp (Garofalo & al. 1999, Ricciardi & al. 2000, Aprile & al. 2002, Catalano & al. 2016), Pugl (Garofalo & al. 1999), Cal (Puntillo 1996, Puntillo & Puntillo 2004), Si (Grillo & Caniglia 2004, Brackel 2008c).
Description: Thallus crustose, indistinct or very thin, pale grey to pale grey-brown, often developing on other crustose lichens. Cortex with the Sedifolia-grey pigment (K+ faintly violet in sections); medulla poorly evident. Apothecia common, 0.3-0.8(-1.2) mm across, with a bright rust-red, flat to finally convex disc becoming darker and brownish with age, and a slightly paler, raised proper margin. Epithecium brownish orange, granular, K+ red; hymenium and hypothecium colourless; paraphyses gradually broadening to 3-4 μm at apex Asci 8-spored, clavate, functionally unitunicate, apically thickened with a broad internal beak, the inner part of apex and external cap I+ blue, Teloschistes-type. Ascospores 2-celled, polarilocular, hyaline, narrowly ellipsoid, 10-18 x 4-6(-8) μm, the equatorial thickening (“septum”) (1.5-)2-3.5 μm, c. 1/5 of spore length. Spot tests: thallus K-, C-, KC-, P- (but section of cortex, when present, K+ faintly violet, N+ red); apothecial disc and proper margin K+ red, C-. Chemistry: cortex with the Sedifolia-grey pigment; epithecium and proper margin of apothecia with unchlorinated anthraquinones.
Note: a holarctic lichen found on calciferous siliceous rocks, including walls, often overgrowing other crustose lichens; on the whole, a heterogeneous taxon in need of revision.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Poorly known taxon in need of further study

Commonnes-rarity: (info)

Alpine belt: very rare
Subalpine belt: rare
Oromediterranean belt: very rare
Montane belt: rather rare
Submediterranean belt: rather common
Padanian area: rare
Humid submediterranean belt: rather common
Humid mediterranean belt: rather rare
Dry mediterranean belt: rare

pH of the substrata:

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Solar irradiation:

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model
Herbarium samples
Index Fungorum GBIF


P.L. Nimis CC BY-SA 04
TSB 2568



Felix Schumm – CC BY-SA 4.0
[5568], Schweiz, Wallis, südwestlich des Simplonpasses, 2370 m.



Felix Schumm – CC BY-SA 4.0
[5568], Schweiz, Wallis, südwestlich des Simplonpasses, 2370 m.


Leif Stridvall - Source: http://www.stridvall.se/lichens/gallery/
Courtesy: Anita Stridvall


Leif Stridvall - Source: http://www.stridvall.se/lichens/gallery/
Courtesy: Anita Stridvall



Felix Schumm - CC BY-SA 4.0
[5568], Schweiz, Wallis, südwestlich des Simplonpasses, 2370 m



Felix Schumm - CC BY-SA 4.0
[5568], Schweiz, Wallis, südwestlich des Simplonpasses, 2370 m



Felix Schumm - CC BY-SA 4.0
[5568], Schweiz, Wallis, südwestlich des Simplonpasses, 2370 m



Pier Luigi Nimis CC BY-SA 4.0
TSB 42438



Pier Luigi Nimis - CC BY-SA 4.0
TSB 38847



Pier Luigi Nimis - CC BY-SA 4.0
TSB 38847



P.L. Nimis CC BY-SA 04
TSB 41329



P.L. Nimis CC BY-SA 04
TSB 41329



P.L. Nimis – CC BY-SA 4.0
Herbarium: TSB 2568 as Caloplaca lamprocheila


Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=277&lang=en
France, Ventoux


Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=277&lang=en
France, Ventoux


Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=277&lang=en
France, Ventoux


Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=277&lang=en
France, Ventoux