Caloplaca obscurella (J. Lahm ex Körb.) Th. Fr.

Lichenogr. Scand., 1: 182, 1871. Basionym: Blastenia obscurella J. Lahm ex Körb. - Parerga Lichenol.: 130, 1860.
Synonyms: Callopisma obscurellum (J. Lahm) J. Lahm; Caloplaca obscurella (J. Lahm) Th. Fr.; Caloplaca refellens (Nyl.) H. Olivier; Caloplaca sarcopisioides (Körb.) Zahlbr.; Lecanora refellens Nyl.; Placodium refellens (Nyl.) A.L. Sm.
Distribution: N - VG, Frl, Ven (Nascimbene & Marini 2010, Nascimbene & al. 2015), TAA (Nascimbene & al. 2007b), Lomb (Alessio & al. 1995), Piem, VA (Valcuvia 2000, Valcuvia & al. 2000b), Emil (Bassi 1995, Nimis & al. 1996, Fariselli & al. 2020). C - Tosc (Tretiach & Nimis 1994, Loppi & al. 1994, Loppi & Putortì 1995, Loppi & al. 1995, Brunialti & Frati 2010, Benesperi 2011, Nascimbene & al. 2012, Paoli & al. 2012), Marc (Nimis & Tretiach 1999), Umb (Ravera 1998, 1999, Ravera & al. 2006), Laz (Bartoli & al. 1997, Massari & Ravera 2002, Nimis & Tretiach 2004, Zucconi & al. 2013), Abr (Nimis & Tretiach 1999), Mol (Nimis & Tretiach 1999, Caporale & al. 2008, Paoli & al. 2015), Sar (Zedda 2002, Rizzi & al. 2011). S - Camp (Garofalo & al. 1999, 2010, Aprile & al. 2002, 2003, 2003b, Nimis & Tretiach 2004, Brunialti & al. 2013, Ravera & Brunialti 2013), Pugl (Nimis & Tretiach 1999), Bas (Nimis & Tretiach 1999, Potenza 2006, Potenza & al. 2010), Cal (Puntillo 1996, Puntillo & Puntillo 2004), Si (Grillo & Caniglia 2004, 2006).
Description: Thallus crustose, thin, corticate, grey, often with a bluish tinge. Soralia often (but not always) present, grey-green to blue-grey, circular and typically crater-like, erose, 0.1-0.3 mm diam., deriving from the rupture of convex vesicles, with granular soredia. Apothecia biatorine, 0.3-0.5(-0.8) mm across, sessile, with a flat to convex, epruinose, brown disc and a thin, usually finally excluded, paler brown margin;an ephemeral thalline margin is often found at the base of young apothecia. Proper exciple brownish in outer part, colourless within, K-; epithecium almost colourless to pale brown, without crystals, K-; hymenium colourless, K/I+ blue; paraphyses lax, septate, simple to forked, 1.5 μm wide at base, the apical cells 3-4(-6) μm wide; hypothecium colourless. Asci 8-spored, Teloschistes-type. Ascospores 1-septate, polarilocular, hyaline, ellipsoid, 10-14 x 4-6(-8) μm, the septum 4-8 μm thick. Photobiont chlorococcoid. Spot tests: thallus and soredia K-, C-, KC-, P-, UV-. Chemistry: thallus and apothecia without lichen substances.
Note: a temperate, perhaps holarctic species found on isolated deciduous trees, probably extinct in most of the Po-plain, but elsewhere not uncommon in orchards. For further details see Arvidsson & Martinsson (1993).
Growth form: Crustose
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: absent
Submediterranean belt: rare
Padanian area: extremely rare
Humid submediterranean belt: rather rare
Humid mediterranean belt: very rare
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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P.L. Nimis CC BY-SA 4.0
TSB 15386



P.L.Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (22173)
2008.02.25



P.L.Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (22173)
2008.02.25



P.L.Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (22173)
2008.02.25



P.L.Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (22868)
2008.02.25



Domenico Puntillo; Owner: Domenico Puntillo
Italy



Felix Schumm – CC BY-SA 4.0
[14947], Germany, Baden-Württemberg, Kreis Göppingen, Faurndau, Friedhof, 314 m, TK 7223; det Aptroot



Felix Schumm – CC BY-SA 4.0
[14947], Germany, Baden-Württemberg, Kreis Göppingen, Faurndau, Friedhof, 314 m, TK 7223; det Aptroot



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (22173)
2001/12/05