Myriolecis reuteri (Schaer.) Śliwa, Zhao Xin & Lumbsch

in Zhao Xin & al., Fungal Divers., 78: 301, 2016. Basionym: Lecanora reuteri Schaer. - Enum. Crit. Lich. Eur.: 59, 1850.
Synonyms: Myriolecis reuteri (Schaer.) Sliwa, Zhao Xin & Lumbsch; Placodium reuteri (Schaer.) A. Massal.
Distribution: N - Frl, Ven (Nascimbene 2004), TAA (Nascimbene 2003b, 2004, Nascimbene & al. 2004, 2004b), VA (GDOR 1853). C - Marc (Nimis & Tretiach 1999), Abr (Nimis & Tretiach 1999, Gheza & al. 2021), Mol (Nimis & Tretiach 1999, Caporale & al. 2008), Sar. S - Camp (Aprile & al. 2003b), Bas (Nimis & Tretiach 1999), Cal (Puntillo 1996).
Description: Thallus crustose-placodioid, episubstratic, ochraceous to pale salmon-pink, more or less covered in a whitish pruina, forming orbicular, strongly convex 0.5-1(-1.5) cm wide rosettes. Lobes convex, contiguous, 1.5-2.5 mm long, 0.7-1.5 mm wide; central part of thallus consisting of convex areoles. Cortex absent or poorly developed; medulla white. Apothecia frequent, lecanorine, 0.6-2.5 mm across, at first half immersed but soon becoming sessile and slightly constricted at base, round but often deformed by mutual compression, with a concave to flat, pale brown to black disc more or less covered in a bluish-white pruina, and a thick thalline margin. Epithecium dark green-brown, at least in young apothecia inspersed with crystals not dissolving in K; hymenium and hypothecium colourless; paraphyses simple or sparsely branched, slightly swollen at apex. Asci 8-spored, cylindrical-clavate, very thin-walled, with a K/I+ blue, tall tholus penetrated by a faintly amyloid apical cushion, the wall K/I-, surrounded by a blue outer layer, Lecanora-type. Ascospores 1-celled, hyaline, broadly ellipsoid, thin-walled, (8-)9-10(-12) x (3.5-)4-5.5(-6.5) µm. Photobiont chlorococcoid. Spot tests: thallus K+ orange yellow, C+ orange, KC+ orange, P-, UV+ orange; disc of apothecia C-, but C+ orange in young, heavily pruinose apothecia. Chemistry: arthothelin, 2,7-dichloronorlichexanthone.
Note: in underhangs or on steeply inclined surfaces of calcareous rocks in upland areas; widespread both in the Alps and in the mountains of Southern Italy.
Growth form: Crustose placodiomorph
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
In underhangs rarely wetted by rain

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: very rare
Oromediterranean belt: rare
Montane belt: rather rare
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


P.L. Nimis CC BY-SA 04
TSB 43787



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (11527)
2001/11/25



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (11527)
2001/11/25



P.L. Nimis CC BY-SA 4.0
TSB 37995



P.L. Nimis CC BY-SA 4.0
TSB 37995



Pier Luigi Nimis - CC BY-SA 4.0
TSB 41464



P.L. Nimis CC BY-SA 4.0
TSB 41464



P.L. Nimis CC BY-SA 4.0
TSB 41464



P.L. Nimis CC BY-SA 4.0
TSB 37868



P.L. Nimis CC BY-SA 4.0
TSB 37868



P.L. Nimis CC BY-SA 4.0
TSB 37868



P.L. Nimis CC BY-SA 4.0
TSB 37868



P.L. Nimis CC BY-SA 4.0
TSB 41464



Pier Luigi Nimis - Department of Life Sciences, University of Trieste - CC BY-SA 4.0
TSB 37389



Pier Luigi Nimis - Department of Life Sciences, University of Trieste - CC BY-SA 4.0
TSB 37389



Pier Luigi Nimis - Department of Life Sciences, University of Trieste - CC BY-SA 4.0
TSB 37390



Pier Luigi Nimis - Department of Life Sciences, University of Trieste - CC BY-SA 4.0
TSB 37390



P.L. Nimis CC BY-SA 04
TSB 43787



Pier Luigi Nimis - Department of Life Sciences, University of Trieste - CC BY-SA 4.0
TSB 37389



P.L. Nimis CC BY-SA 04
TSB 43787



P.L. Nimis CC BY-SA 04
TSB 43788



P.L. Nimis CC BY-SA 04
TSB 43788