Acarospora privigna (Ach.) A. Schneid.

Guide Study Lich.: 152, 1898. Basionym: Lecidea privigna Ach. - Meth. Lich. Sect. prior: 49, 1803
Synonyms: Acarospora simplex (Taylor) Jatta; Bacidia simplex (Taylor) Branth & Rostr.; Polysporina simplex (Taylor) Vězda; Sarcogyne privigna (Ach.) A. Massal. non auct.; Sarcogyne regularis var. decipiens (A. Massal.) N.S. Golubk. nomen sed non planta?; Sarcogyne simplex (Taylor) Nyl.; Sarcogyne simplex var. minor B. de Lesd.?; Sarcogyne simplex var. strepsodina (Ach.) Stein
Distribution: N - VG (Castello 2002, Martellos & Castello 2004), Frl (Tretiach & Hafellner 2000), Ven (Lazzarin 2000b), TAA (Thor & Nascimbene 2007, Isocrono & al. 2008, Lang 2009), Lomb, Piem (Isocrono & al. 2004, Favero-Longo & al. 2004, 2006b, 2015, 2015b, Isocrono & Piervittori 2008), VA (Piervittori & Isocrono 1999, Favero-Longo & Piervittori 2009, Matteucci & al. 2015c), Emil (Fariselli & al. 2020), Lig (Giordani & al. 2016). C - Tosc (Brackel 2015), Laz, Abr, Sar (Nöske 2000, Neuwirth 2018). S - Camp (Nimis & Tretiach 2004), Bas (Nimis & Tretiach 1999), Cal (Puntillo 1996, Puntillo & Puntillo 2004), Si (Nimis & al. 1996b, Iacolino & Ottonello 2006).
Description: Thallus crustose, usually endolithic and not apparent, sometimes visible as a thin, pale grey to olive-brown film around the ascomata. Apothecia lecideine, more or less immersed or sessile, often deformed by mutual compression, 0.3-0.8(-1) mm across, scattered or clustered, but most often arranged in lines along rock crevices, with a black to brown-black, round, flat to slightly concave, non-gyrose disc, and a concolorous, crenulated margin extending to disc and sometimes giving it an umbonate appearance. Proper exciple carbonized in outer part, yellowish to colourless within; epithecium blackened with reddish areas; hymenium colourless, 90-130 μm high, often divided by sterile columns of conglutinated hyphae, usually I+ blue eventually turning red; paraphyses coherent, 1-1.5(-2) µm thick at base, hardly expanded at apex; hypothecium colourless. Asci >200-spored, clavate to subcylindrical, strongly thickened at apex, the apical dome K/I-, the outer coat K/I+blue. Ascospores 1-celled, hyaline, narrowly ellipsoid to almost bacilliform, 3-5(-6) x 1-1.5 μm. Photobiont chlorococcoid. Spot tests: all negative. Chemistry: without lichen substances.
Note: a holarctic early coloniser of small cracks of siliceous, sometimes base-rich or slightly calciferous rocks.
Growth form: Crustose endolithic
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Pioneer species

Commonnes-rarity: (info)

Alpine belt: rather rare
Subalpine belt: rather common
Oromediterranean belt: rare
Montane belt: very rare
Submediterranean belt: very rare
Padanian area: absent
Humid submediterranean belt: rather rare
Humid mediterranean belt: rare
Dry mediterranean belt: very 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; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (35354)
2002/07/16



Felix Schumm – CC BY-SA 4.0
[4280], Schweiz, Kanton Graubünden, Unterengadin, Lavin auf Granitblöcken oberhalb des Hotels Crusch Alba, ca. 1460 m. Leg. et det. Schumm 25.08.1995.



Felix Schumm – CC BY-SA 4.0
[4280], Schweiz, Kanton Graubünden, Unterengadin, Lavin auf Granitblöcken oberhalb des Hotels Crusch Alba, ca. 1460 m. Leg. et det. Schumm 25.08.1995.



Felix Schumm – CC BY-SA 4.0
[4280], Schweiz, Kanton Graubünden, Unterengadin, Lavin auf Granitblöcken oberhalb des Hotels Crusch Alba, ca. 1460 m. Leg. et det. Schumm 25.08.1995.



Felix Schumm – CC BY-SA 4.0
[4280], Schweiz, Kanton Graubünden, Unterengadin, Lavin auf Granitblöcken oberhalb des Hotels Crusch Alba, ca. 1460 m. Leg. et det. Schumm 25.08.1995.



Felix Schumm – CC BY-SA 4.0
[4280], Schweiz, Kanton Graubünden, Unterengadin, Lavin auf Granitblöcken oberhalb des Hotels Crusch Alba, ca. 1460 m. Leg. et det. Schumm 25.08.1995.



Felix Schumm – CC BY-SA 4.0
[4280], Schweiz, Kanton Graubünden, Unterengadin, Lavin auf Granitblöcken oberhalb des Hotels Crusch Alba, ca. 1460 m. Leg. et det. Schumm 25.08.1995.



Pier Luigi Nimis - CC BY-SA 4.0
TSB 41297


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


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