Acarospora praeruptorum H. Magn.

Svensk bot. Tidskr. 18: 330, 1924.
Synonyms: Acarospora nitrophila auct. ital. non H. Magn.; Acarospora nitrophila var. praeruptorum (H. Magn.) Clauzade & Cl. Roux; Acarospora nitrophila var. tiroliensis (H. Magn.) Clauzade & Cl. Roux
Distribution: N - TAA (Nascimbene 2004), Lomb, Piem (Morisi & Sereno 1995, Matteucci & al. 2013, Giordani & al. 2014), VA (Piervittori & Isocrono 1999, Isocrono & al. 2008, Favero-Longo & Piervittori 2009, Matteucci & al. 2015c), Lig. C - Tosc, Marc (Nimis & Tretiach 1999). S - Bas (Nimis & Tretiach 1999), Si (Nimis & al. 1996b, Grillo & Caniglia 2004).
Description: Thallus crustose, episubstratic, yellowish brown to brown when dry, greenish brown when wet, areolate-subsquamulose. Areoles contiguous, 1-2 mm wide, smooth, sometimes indistinctly lobulate. Algal layer interrupted by narrow hyphal bands (mostly 10 μm wide), without algal palisades. Apothecia lecanorine, immersed in the areoles, 1-6 per areole, to 1.2 mm across, mostly rounded, with a concave to flat, dark reddish brown disc (usually darker than thallus), and a rather thick thalline margin. Epithecium brown; hymenium colourless, 70-130 μm high; paraphyses 1.5-2(-2.5) μm thick at base, the apical cells to 5(-6) μm wide; hyothecium colourless. Asci 100-200-spored, clavate. Ascospores 1-celled, hyaline, ellipsoid, 3-5 x 1.5-2 μm. Pycnidia immersed. Conidia ellipsoid, c. 3 x 3.5 μm. Photobiont chlorococcoid. Spot tests: thallus and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a lichen of steeply inclined to underhanging faces of basic siliceous rocks, usually in species-poor communities, mostly near settlements. This species has been often considered as a synonym of Acarospora nitrophila H. Magn, but according to Knudsen & Kocourková (2017) that species is hitherto known only from Scandinavia, and all records of A. nitrophila from Italy should be considered as dubious. For the time being, I place here all records of A. nitrophila from Italy.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
In underhangs rarely wetted by rain
Pioneer species

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: very rare
Oromediterranean belt: absent
Montane belt: very rare
Submediterranean belt: very rare
Padanian area: extremely rare
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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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Felix Schumm CC BY-SA 4.0
Germany, Baden-Württemberg, Kreis Göppingen, Wangen, Johann-Sebastian-Bach-Str. 14, 48.72438° N, 9.60360° E, 370 m



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: Herb. J.Nascimbene
2003/03/31
var.praeruptorum



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (29921)
2003/03/11



Felix Schumm – CC BY-SA 4.0
[17985], Germany, Baden-Württemberg, Kreis Göppingen, Wangen, Johann-Sebastian-Bach-Str. 14, 48.72438° N, 9.60360° E, 370 m, auf altem Markisenstoff. TK 7223/4. Leg. Schumm 27.04.2012



Felix Schumm – CC BY-SA 4.0
[17985], Germany, Baden-Württemberg, Kreis Göppingen, Wangen, Johann-Sebastian-Bach-Str. 14, 48.72438° N, 9.60360° E, 370 m, auf altem Markisenstoff. TK 7223/4. Leg. Schumm 27.04.2012



Felix Schumm – CC BY-SA 4.0
[17985], Germany, Baden-Württemberg, Kreis Göppingen, Wangen, Johann-Sebastian-Bach-Str. 14, 48.72438° N, 9.60360° E, 370 m, auf altem Markisenstoff. TK 7223/4. Leg. Schumm 27.04.2012



Felix Schumm – CC BY-SA 4.0
[17985], Germany, Baden-Württemberg, Kreis Göppingen, Wangen, Johann-Sebastian-Bach-Str. 14, 48.72438° N, 9.60360° E, 370 m, auf altem Markisenstoff. TK 7223/4. Leg. Schumm 27.04.2012



Felix Schumm – CC BY-SA 4.0
[17985], Germany, Baden-Württemberg, Kreis Göppingen, Wangen, Johann-Sebastian-Bach-Str. 14, 48.72438° N, 9.60360° E, 370 m, auf altem Markisenstoff. TK 7223/4. Leg. Schumm 27.04.2012


Magnusson A. H. (1935) Acarosporaceae, Thelocarpaceae. - In: Rabenhorst G. L.: Kryptogamen-Flora von Deutschland, Österreich, und der Schweiz-. 2nd- IX. Die Flechten. Abt. 5- 1. Gebr. Borntraeger. Leipzig, pp. 1-318. – Public Domain



Felix Schumm – CC BY-SA 4.0
[17985], Germany, Baden-Württemberg, Kreis Göppingen, Wangen, Johann-Sebastian-Bach-Str. 14, 48.72438° N, 9.60360° E, 370 m, auf altem Markisenstoff. TK 7223/4. Leg. Schumm 27.04.2012