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, episubstratic, areolate. Areoles 0.2-1.2 mm in diam., dispersed or gathered in small clusters, round to slightly angular, flat to slightly convex, usually smooth, chestnut brown, generally epruinose, with a usually darker margin and lower surface. Cortex paraplectenchymatous, c. 15 µm thick; algal layer continuous. Apothecia 0.1-0.6 mm across, persistently immersed, usually slightly crateriform, 1-5 per squamule, with a concave, reddish brown to almost black, smooth or rarely umbonate disc, and an indistinct to very slightly raised thalline margin. Proper exciple thin, 10-15(-20)µm wide; epithecium pale brown; hymenium colourless, 60-90(-110) μm high, hemiamyloid, K/I+ red; 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: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: without 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:


Solar irradiation:








Altitudinal distribution:


Predictive model
Herbarium samples

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)