Squamarina lamarckii (DC.) Poelt

Mitt. bot. Staatss. München, 2: 538, 1958. Basionym: Urceolaria lamarckii DC. in Lamarck & de Candolle - Fl. Franç., 3 éd., 2: 372, 1805.
Synonyms: Lecanora lagascae Ach.; Lecanora lamarckii (DC.) Rabenh.; Parmelia lagascae (Ach.) Spreng.; Placodium lamarckii (DC.) Müll. Arg.; Psoroma lagascae (Ach.) Körb.; Squamaria lagascae (Ach.) Balb.
Distribution: N - Frl, Ven (Nimis 1994), TAA (Nascimbene 2008b, Nascimbene & al. 2022), Lomb (Dalle Vedove & al. 2004), Piem (Isocrono & al. 2004), Emil (Fariselli & al. 2020). C - Tosc, Abr (Nimis & Tretiach 1999), Sar.
Description: Thallus squamulose, 1-3 mm thick, forming up to more than 10 cm wide patches. Squamules 1-5 mm wide, pale brown but densely white-pruinose, becoming darker when wet, more or less convex, contiguous to overlapping, the peripheral ones more flattened, longer and slightly lobulate; lower surface largely black, with black rhizinoid hyphal strands. Upper cortex paraplectenchymatous, well delimited against the thick, white medulla. Apothecia rather rare, rounded, lecanorine, sessile, strongly constricted at base, 2-10 mm across, with a concave to flat, pale brown, initially pruinose disc, and a thick, irregularly crenulate thalline margin. Epithecium brownish, granular; hymenium colourless, hemiamyloid; paraphyses slightly thickened above; hypothecium colourless. Asci 8-spored, elongate-clavate, with a thin, outer amyloid layer and a thickened, amyloid tholus devoid of an ocular chamber, penetrated by an axial tube the sides of which stain I+ deeper blue, approaching the Porpidia-type. Ascospores 1-celled, hyaline, ellipsoid, 11-18 x 4-6 µm. Photobiont chlorococcoid. Spot tests: cortex K-, C-, KC-, P-; medulla P+ yellow. Chemistry: cortex with usnic and isousnic acids, medulla with and 2ʹ-O-demethylpsoromic acids.
Note: on steeply inclined surfaces of calcareous rocks with short periods of water seepage after rain, mostly near and above treeline; rarer in the Apennines than in the Alps, to be looked for in the mountains of Southern Italy.
Growth form: Squamulose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: extremely rare
Subalpine belt: very rare
Oromediterranean belt: extremely rare
Montane belt: absent
Submediterranean belt: absent
Padanian area: absent
Humid submediterranean belt: absent
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
Index Fungorum GBIF


P.L. Nimis CC BY-SA 04
TSB 16082



Juri Nascimbene – CC BY-SA 4.0; Owner: Department of ùLife Sciences, University of Trieste
Molazza, Italy



Juri Nascimbene – CC BY-SA 4.0; Owner: Department of ùLife Sciences, University of Trieste
Molazza, Italy



P.L. Nimis CC BY-SA 04
TSB 41734



P.L. Nimis CC BY-SA 04
TSB 37394



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (16082)
2001/12/11


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Text_S/Squamarina_lamarckii.htm
France, 20/07/2015 - session AFL dans le Parc du Mercantour - Alpes-de-Haute-Provence


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Text_S/Squamarina_lamarckii.htm
France, 20/07/2015 - session AFL dans le Parc du Mercantour - Alpes-de-Haute-Provence


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Text_S/Squamarina_lamarckii.htm
France, 20/07/2015 - session AFL dans le Parc du Mercantour - Alpes-de-Haute-Provence


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Text_S/Squamarina_lamarckii.htm
France, 20/07/2015 - session AFL dans le Parc du Mercantour - Alpes-de-Haute-Provence


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Text_S/Squamarina_lamarckii.htm
France, 20/07/2015 - session AFL dans le Parc du Mercantour - Alpes-de-Haute-Provence