Rhizocarpon lecanorinum Anders

Hedwigia, 64: 261, 1923.
Synonyms: Diplotomma geographicum f. lecanorinum (Anders) Jatta; Lecidea atrovirens var. lecanora Flörke; Rhizocarpon atrovirens auct. p.p.; Rhizocarpon geographicum var. lecanorum (Flörke) A. Massal.; Rhizocarpon lecanora (Flörke) Lynge comb. inval.
Distribution: N - VG, Frl (TSB 3828), Ven, TAA (Nascimbene & al. 2022), Lomb, Piem (Favero-Longo & al. 2006b), VA (Piervittori & Isocrono 1999, Matteucci & al. 2008c), Lig (Ravera & al. 2022). C - Marc (Nimis & Tretiach 1999, Umb (Panfili 2000, 2003, Ravera & al. 2006), Laz, Abr (Nimis & Tretiach 1999), Mol (Caporale & al. 2008), Sar. S - Camp (Garofalo & al. 1999, Nimis & Tretiach 2004), Pugl (Nimis & Tretiach 1999), Bas (Nimis & Tretiach 1999), Cal (Puntillo 1996, Puntillo & Puntillo 2004, Scarciglia & al. 2012, 2012b), Si (Brackel 2008b, 2008c).
Description: Thallus crustose, areolate, greenish yellow to grey-green, forming patches to 5-6 cm across, several thalli often merging to cover larger surfaces. Areoles 0.6-2 mm diam., dispersed to contiguous, smooth, matt, sometimes flat but most often convex to round, partially or totally enclosing apothecia, but typically horseshoe-shaped. Cortex 25-50 µm thick; medulla white, I+ blue. Apothecia lecideine, 0.5-1.2 mm across, one per areole (very seldom several), more or less circular, flat to concave, with a black, not pruinose disc and a thin, often finally excluded, black proper margin. Cortex cells of excipulum brownish, K+ brown-red; epithecium thin, dirty green, K+ brighter green; hymenium greenish to colourless, 160-200 µm thick; paraphysoids strongly conglutinate, richly branched and anastomosing, sometimes slightly capitate; hypothecium brown, K-. Asci 8-spored, clavate, fissitunicate, with a well-developed tholus, lacking an ocular chamber, Rhizocarpon-type. Ascospores muriform, blackish brown, with 15-38 cells in section, (27-)34-45(-57) x (11-)15-20(-24) µm. Photobiont: chlorococcoid. Spot tests: medulla K+ yellow, C-, KC-, P+ brick red. Chemistry: cortex with rhizocarpic acid, medulla with stictic acid.
Note: a temperate to boreal-montane, circumpolar lichen, most common on stonewalls, dust-impregnated siliceous boulders and roofing tiles, but also found in natural habitats, e.g. with Umbilicaria deusta.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: extremely rare
Subalpine belt: very rare
Oromediterranean belt: absent
Montane belt: rare
Submediterranean belt: very rare
Padanian area: absent
Humid submediterranean belt: very rare
Humid mediterranean belt: absent
Dry mediterranean belt: absent

pH of the substrata:

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Solar irradiation:

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Aridity:

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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

Walter Obermayer CC BY-SA 4.0 - Source: Lichens of Noricum - http://lichens-of-noricum.uni-graz.at/



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (35726)
2003/01/22



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (34631)
2002/01/22



Domenico Puntillo; Owner: Domenico Puntillo
Italy



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (13925)
2001/12/01



Pier Luigi Nimis - CC BY-SA 4.0
TSB 38641



Pier Luigi Nimis - CC BY-SA 4.0
TSB 38641


Mark Rahill - CC BY-SA 4.0
USA


Mark Rahill - CC BY-SA 4.0


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_R/Rhizocarpon_lecanorinum.htm
France, 7/7/2013 - Capanello, lac de Bastani-Monte-Rinosu - Corse


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_R/Rhizocarpon_lecanorinum.htm
France, 7/7/2013 - Capanello, lac de Bastani-Monte-Rinosu - Corse


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_R/Rhizocarpon_lecanorinum.htm
France, 7/7/2013 - Capanello, lac de Bastani-Monte-Rinosu - Corse


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_R/Rhizocarpon_lecanorinum.htm
France, 7/7/2013 - Capanello, lac de Bastani-Monte-Rinosu - Corse


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=488&lang=en
France, Plougonven


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=488&lang=en
France, Plougonven


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=488&lang=en
France, Roc'h an Daol


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=488&lang=en
France, Roc'h an Daol


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=488&lang=en
France, Roc'h an Daol


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=488&lang=en
France, Roc'h an Daol


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=488&lang=en
France, Roc'h an Daol


Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=488&lang=en
France, Ardennes


Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=488&lang=en
France, Ardennes


Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=488&lang=en
France, Ardennes


Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=488&lang=en
France, Ardennes


Ulrich Kirschbaum
Central Europe; Germany; Hesse: Rhoen Mountains. on siliceous rocks


Ulrich Kirschbaum
Central Europe; Germany; Hesse: Rhoen Mountains. on siliceous rocks