Squamulea subsoluta (Nyl.) Arup, Søchting & Frödén

Nord. J. Bot., 31: 56, 2013. Basionym: Lecanora murorum var. subsoluta Nyl. in Wedd. - Bull. Soc. bot. Fr., 23: 98, 1876.
Synonyms: Callopisma aurantiacum var. gyalectoides A. Massal. sensu Jatta; Callopisma aurantiacum var. irrubescens Arnold; Caloplaca aurantia var. irrubescens (Arnold) Jatta; Caloplaca irrubescens (Arnold) Zahlbr.; Caloplaca subsoluta (Nyl.) Zahlbr.
Distribution: N - Frl (TSB 10832), Ven, TAA (Nascimbene & al. 2022), Lomb, Piem (Favero-Longo & al. 2015), VA (Piervittori & Isocrono 1999, Piervittori & al. 2001), Emil (Fariselli & al. 2020), Lig (Giordani & al. 2016). C - Tosc, Laz, Sar (Monte 1993, Rizzi & al. 2011, Neuwirth 2018, Nascimbene & al. 2023). S - Pugl, Bas (Nimis & Tretiach 1999), Cal (Puntillo 1996), Si (Poli & al. 1995, Nimis & al. 1996b, Grillo & al. 1996, Ottonello & Romano 1997, Grillo 1998, Grillo & Caniglia 2004).
Description: Thallus crustose-subsquamulose, episubstratic, bright orange to brownish yellow, of small, flat, c. 0.5 mm wide, scattered to contiguous subsquamulose areoles developing on a black hypothallus. Cortex paraplectenchymatous, 15-30 µm thick, inspersed with crystals of anthraquinones; medulla thin, inconspicuous. Apothecia zeorine, adnate, 0.2-0.6 mm across, with an orange to red-orange, flat to convex disc and a smooth, paler, persistent proper margin. Proper exciple paraplectenchymatous, brownish orange in outer part, colourless within, the pigmented parts K+ red; epithecium orange-brown, K+ red; hymenium colourless, 60-80 µm high; paraphyses simple or sparingly branched in upper part, c. 1.5 μm thick at base, the apical cells slightly swollen, 2-3(-5) μm wide; hypothecium colourless, the lower part paraplectenchymatous, with 3-5 μm wide cells. Asci 8-spored, cylindrical-clavate, Teloschistes-type. Ascospores 2-celled, polarilocular, broadly ellipsoid, (9-)10-13(-15) x (4.5-)6-8 μm, the equatorial thickening (“septum”) 3-5 μm (1/4-1/2 of spore length). Photobiont chlorococcoid. Spot tests: thallus and apothecia K+ red, C-, KC-, P-. Chemistry: thallus and apothecia with parietin, fallacinal, emodin, and teloschistin.
Note: a mild-temperate to subtropical, widespread lichen found on steeply inclined, sunny surfaces of basic siliceous rocks, often with Peltula euploca, but less bound to seepage tracks.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
On otherwise dry surfaces with short periods of water seepage after rain

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: very rare
Oromediterranean belt: very rare
Montane belt: extremely rare
Submediterranean belt: very rare
Padanian area: absent
Humid submediterranean belt: rare
Humid mediterranean belt: rather rare
Dry mediterranean belt: rather 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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Predictive model
Herbarium samples


Felix Schumm - CC BY-SA 4.0
[19594], Gallia, Var. Evenos, alt. 300 m, ad saxa basaltica locis apricis. Leg. Y. Rondon, 3.04.1972. VEZDA: LICHENES SELECTI EXSICCATI NR. 1171.
As Caloplaca irrubescens



Andrea Moro; Owner: Department of Life Sciences, University of Trieste
Italy, Lazio, Roma, Ruines of ancient Tusculum, above Frascati
18/03/2017



Andrea Moro; Owner: Department of Life Sciences, University of Trieste
Italy, Lazio, Roma, Ruines of ancient Tusculum, above Frascati
18/03/2017



Andrea Moro; Owner: Department of Life Sciences, University of Trieste
Italy, Lazio, Roma, Ruines of ancient Tusculum, above Frascati
18/03/2017



Andrea Moro; Owner: Department of Life Sciences, University of Trieste
Italy, Lazio, Roma, Ruines of ancient Tusculum, above Frascati
18/03/2017



Felix Schumm - CC BY-SA 4.0
[19594], Gallia, Var. Evenos, alt. 300 m, ad saxa basaltica locis apricis. Leg. Y. Rondon, 3.04.1972. VEZDA: LICHENES SELECTI EXSICCATI NR. 1171.
As Caloplaca irrubescens



Felix Schumm - CC BY-SA 4.0
[19594], Gallia, Var. Evenos, alt. 300 m, ad saxa basaltica locis apricis. Leg. Y. Rondon, 3.04.1972. VEZDA: LICHENES SELECTI EXSICCATI NR. 1171.
As Caloplaca irrubescens



Felix Schumm - CC BY-SA 4.0
[19594], Gallia, Var. Evenos, alt. 300 m, ad saxa basaltica locis apricis. Leg. Y. Rondon, 3.04.1972. VEZDA: LICHENES SELECTI EXSICCATI NR. 1171.
As Caloplaca irrubescens



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
[19594], Gallia, Var. Evenos, alt. 300 m, ad saxa basaltica locis apricis. Leg. Y. Rondon, 3.04.1972. VEZDA: LICHENES SELECTI EXSICCATI NR. 1171.
as Caloplaca irrubescens



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
[19594], Gallia, Var. Evenos, alt. 300 m, ad saxa basaltica locis apricis. Leg. Y. Rondon, 3.04.1972. VEZDA: LICHENES SELECTI EXSICCATI NR. 1171.
as Caloplaca irrubescens



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
[19594], Gallia, Var. Evenos, alt. 300 m, ad saxa basaltica locis apricis. Leg. Y. Rondon, 3.04.1972. VEZDA: LICHENES SELECTI EXSICCATI NR. 1171.
as Caloplaca irrubescens



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
[19594], Gallia, Var. Evenos, alt. 300 m, ad saxa basaltica locis apricis. Leg. Y. Rondon, 3.04.1972. VEZDA: LICHENES SELECTI EXSICCATI NR. 1171.
as Caloplaca irrubescens



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
[19594], Gallia, Var. Evenos, alt. 300 m, ad saxa basaltica locis apricis. Leg. Y. Rondon, 3.04.1972. VEZDA: LICHENES SELECTI EXSICCATI NR. 1171.
as Caloplaca irrubescens



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
[19594], Gallia, Var. Evenos, alt. 300 m, ad saxa basaltica locis apricis. Leg. Y. Rondon, 3.04.1972. VEZDA: LICHENES SELECTI EXSICCATI NR. 1171.
as Caloplaca irrubescens



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
[19594], Gallia, Var. Evenos, alt. 300 m, ad saxa basaltica locis apricis. Leg. Y. Rondon, 3.04.1972. VEZDA: LICHENES SELECTI EXSICCATI NR. 1171.
as Caloplaca irrubescens



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
[19594], Gallia, Var. Evenos, alt. 300 m, ad saxa basaltica locis apricis. Leg. Y. Rondon, 3.04.1972. VEZDA: LICHENES SELECTI EXSICCATI NR. 1171.
as Caloplaca irrubescens



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
[19594], Gallia, Var. Evenos, alt. 300 m, ad saxa basaltica locis apricis. Leg. Y. Rondon, 3.04.1972. VEZDA: LICHENES SELECTI EXSICCATI NR. 1171.
as Caloplaca irrubescens



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
[19594], Gallia, Var. Evenos, alt. 300 m, ad saxa basaltica locis apricis. Leg. Y. Rondon, 3.04.1972. VEZDA: LICHENES SELECTI EXSICCATI NR. 1171.
as Caloplaca irrubescens



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
[19594], Gallia, Var. Evenos, alt. 300 m, ad saxa basaltica locis apricis. Leg. Y. Rondon, 3.04.1972. VEZDA: LICHENES SELECTI EXSICCATI NR. 1171.
as Caloplaca irrubescens



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
[19594], Gallia, Var. Evenos, alt. 300 m, ad saxa basaltica locis apricis. Leg. Y. Rondon, 3.04.1972. VEZDA: LICHENES SELECTI EXSICCATI NR. 1171.
as Caloplaca irrubescens



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
[19594], Gallia, Var. Evenos, alt. 300 m, ad saxa basaltica locis apricis. Leg. Y. Rondon, 3.04.1972. VEZDA: LICHENES SELECTI EXSICCATI NR. 1171.
as Caloplaca irrubescens



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
[19594], Gallia, Var. Evenos, alt. 300 m, ad saxa basaltica locis apricis. Leg. Y. Rondon, 3.04.1972. VEZDA: LICHENES SELECTI EXSICCATI NR. 1171.
as Caloplaca irrubescens



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
[19594], Gallia, Var. Evenos, alt. 300 m, ad saxa basaltica locis apricis. Leg. Y. Rondon, 3.04.1972. VEZDA: LICHENES SELECTI EXSICCATI NR. 1171.
as Caloplaca irrubescens


Nere Sorrentino
Spain, Canary Islands, Tenerife


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Text_S3/Squamulea_subsoluta.htm
France, session AFL 2010 - sur roche basaltique - Hérault


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Text_S3/Squamulea_subsoluta.htm
France, session AFL 2010 - sur roche basaltique - Hérault