Acarospora scotica Hue

Nouv. Arch. Mus. Hist. Nat., Paris, 5, sér. 1: 147, 1909.
Synonyms:
Distribution: N - Lomb (S-F99329, De Vita & Valcuvia 2004), Piem (Valcuvia 2002, 2002b), Emil (TSB 35572). C - Tosc, Laz, Sar (Rizzi & al. 2011, Giordani & al. 2013).
Description: Thallus crustose, episubstratic, consisting of scattered to contigugous, angular, 0.2-1 mm wide, 0.1-0.3 mm thick, epruinose, slightly concave, dark reddish brown areoles with a raised, often wavy, black margin. Cortex paraplectenchymatous, 15-40 µm thick, brown in upper part, colourless in lower part; algal layer more or less continuous; medulla white, prosoplectenchymatous. Apothecia rounded, 0.2-0.8 mm across, immersed in the areoles, usually one per areole, with a dark brown disc, a poorly evident thalline margin, and sometimes a concentric, thin proper margin. Parathecium c. 10 µm thick; epithecium brown; hymenium colourless, 50-90 µm high; paraphyses coherent, (1.3-)1.5-2.5 µm thick at base, the apices usually not markedly expanded; hypothecium colourless. Asci c. 100-spored, clavate, the apical dome K/I-. Ascospores 1-celled hyaline ellipsoid, (3-)4-5.5 x (1.5-)2-2.5 µm. Photobiont chlorococcoid. Spot tests: thallus and medulla K-, C-, KC-, P-, UV- . Chemistry: without lichen substances.
Note: a probably Mediterranean-Atlantic species of siliceous rocks wetted by rain, reaching the montane belt in dry-continental areas (e.g. in the Alps).
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: absent
Submediterranean belt: extremely rare
Padanian area: absent
Humid submediterranean belt: extremely rare
Humid mediterranean belt: extremely 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 CC BY-SA 4.0
TSB 10170