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, the areoles contiguous, 1-2 mm wide, smooth, almost substipitate, sometimes indistinctly lobulate, the lower surface brown. Algal layer continuous or 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 rich in algae. Proper exciple thin, poorly developed; 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; hypothecium colourless. Asci 100-200-spored, clavate, the apical dome K/I-. 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: cortex 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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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


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