Acarospora veronensis A. Massal.

Ric. Auton. Lich. Crost.: 29, 1852.
Synonyms: Acarospora africana B. de Lesd.?; Acarospora silicicola B. de Lesd.; Acarospora smaragdula var. veronensis (A. Massal.) Anzi
Distribution: N - VG (Castello 2002, Martellos & Castello 2004), Frl, Ven (Lazzarin 2000b), TAA, Lomb, Piem (Favero-Longo & al. 2015), VA (Piervittori & Isocrono 1999, Matteucci & al. 2015c), Emil (Fariselli & al. 2020), Lig. C - Tosc, Umb (Genovesi & Ravera 2001, Ravera & al. 2006, 2011, Genovesi 2011), Laz (Genovesi & al. 2011), Abr (Nimis & Tretiach 1999), Mol (Nimis & Tretiach 1999, Caporale & al. 2008), Sar (Rizzi & al. 2011, Cossu & al. 2015). S - Camp (Nimis & Tretiach 2004), Pugl (Nimis & Tretiach 1999), Si (Ottonello & Salone 1994, Grillo & Caniglia 2004).
Description: Thallus crustose, epilithic, areolate. Areoles 0.2-1.2 mm diam., dispersed or gathered in small clusters, round to slighlty angular, flat to slightly convex, usually smooth, chestnut brown, generally not pruinose, with a usually darker margin and lower surface. Upper cortex paraplectenchymatous, underlain by a continuous algal layer. Apothecia 0.1-0.6 mm across, immersed or slightly protruding, usually slightly crateriform, 1-5 per squamule, with a concave, reddish brown to almost black, smooth or rarely umbonate disc, and an indistinct to slightly raised thalline margin. Epithecium pale brown; hymenium colourless, 60-110 μm tall; paraphyses 1.3-2 µm thick at base, 3-4 µm at apex; hypothecium colourless or pale straw. Asci 100-200-spored, cylindrical-clavate, the apical dome K/I-. Ascospores 1-celled, hyaline, subcylindrical, 3-5 x 1-2 μm. Photobiont chlorococcoid. Spot tests: all negative. Chemistry: no lichen substances.
Note: a holarctic early coloniser of base- rich siliceous pebbles, roofing tiles, walls, sometimes also found on soil and lignum, also in small settlements: occasionally overgrowing other crustose lichens, with a wide altitudinal range.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Pioneer species

Commonnes-rarity: (info)

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


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 1283


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



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (1283)
2001/11/21