Myriolecis pruinosa (Chaub.) Śliwa, Zhao Xin & Lumbsch

in Zhao Xin & al., Fungal Divers., 78: 301, 2016. Basionym: Lecanora pruinosa Chaub. in St.-Amans - Fl. Agenaise: 495, 1821.
Synonyms: Lecanora adriatica Zahlbr.; Lecanora cretacea (Müll. Arg.) Stizenb.; Lecanora lagostana Zahlbr.; Lecanora pruinifera Nyl.; Lecanora sulphurascens Nyl.; Lecanora teichotea Nyl.; Myriolecis pruinosa (Chaub.) Sliwa, Zhao Xin & Lumbsch; Placodium cretaceum Müll. Arg.; Placodium myrrhinum auct.; Squamaria sulphurascens (Nyl.) H. Olivier
Distribution: N - VG, Frl, Ven, Emil (Fariselli & al. 2020), Lig. C - Tosc (Benesperi 2000a, 2006, Paoli & al. 2014b), Marc (Nimis & Tretiach 1999), Umb (Nimis & Tretiach 1999, Ravera & al. 2006, Brackel 2015), Laz (Bartoli & al. 1998, Nimis & Tretiach 2004, Roccardi & Ricci 2006, Pietrini & al. 2008, Genovesi & al. 2011), Abr (Nimis & Tretiach 1999, Caporale & al. 2016), Mol (Nimis & Tretiach 1999, Caporale & al. 2008), Sar. S - Camp (Aprile & al. 2003, 2003b, Nimis & Tretiach 2004, Garofalo & al. 2010), Pugl (Nimis & Tretiach 1999, Durini & Medagli 2002), Bas (Nimis & Tretiach 1999), Cal (Puntillo 1996), Si (Nimis & al. 1994, 1996b, Ottonello & al. 1994, 1996, 2011, Ottonello & Romano 1997, Grillo 1998, Caniglia & Grillo 2001, 2005, 2006, Grillo & al. 2001, 2002, 2007b, 2009, Grillo & Caniglia 2004, Merlo 2004b, Brackel 2008b, 2008c, Liistro & Cataldo 2011).
Description: Thallus crustose-placodioid, episubstratic, yellowish white to pale grey, usually densely white-pruinose, forming orbicular rosettes to 2(-4) cm in diam. Marginal lobes 1-2 x 0.3 0.8 mm, flat to slightly convex, not overlapping; central part of thallus areolate. Cortex absent or poorly developed; medulla white. Apothecia frequent, lecanorine, 0.3-1(-1.5) mm across, at first half immersed but soon becoming sessile and constricted at base, with a pale to dark brown-black, often slightly white-pruinose disc, and a thick, white-pruinose thalline margin. Epithecium yellow-brown, inspersed with crystals not dissolving in K; hymenium and hypothecium colourless; paraphyses simple or sparsely branched, slightly swollen at apex. Asci 8-spored, 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, 8-13(-15) x 4-7(-8) μm. Photobiont chlorococcoid. Spot tests: thallus K+ pale yellow, C+ orange, KC+ orange, P-, UV+ orange; disc of apothecia always C-. Chemistry: arthothelin, 2,7-dichlorlichexanthone.
Note: a mainly temperate species found on limestone, dolomite, mortar, brick and, more rarely, basic siliceous rocks; mainly Tyrrhenian, and there often found in settlements and on man-made substrata, much rarer along the Adriatic side of the Peninsula, and there most common in upland areas in underhangs of calcareous rocks. A dubious record from Valle d'Aosta (see Piervittori & Isocrono 1999: 129) is not accepted here.
Growth form: Crustose placodiomorph
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)
In underhangs rarely wetted by rain

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: extremely rare
Oromediterranean belt: very rare
Montane belt: rare
Submediterranean belt: rare
Padanian area: extremely rare
Humid submediterranean belt: common
Humid mediterranean belt: rather common
Dry mediterranean belt: extremely rare

pH of the substrata:

12345

Solar irradiation:

12345

Aridity:

12345

Eutrophication:

12345

Poleotolerance:

0123

Altitudinal distribution:

123456


Predictive model
Herbarium samples


Andrea Moro; Owner: Department of Life Sciences, University of Trieste
Italy, Friuli Venezia Giulia, Trieste, Trieste, Conconello
14/02/2017


Department of Life Sciences, University of Trieste
Herbarium: TSB (8587)
2001/11/25



Domenico Puntillo; Owner: Domenico Puntillo
Italy



Andrea Moro; Owner: Department of Life Sciences, University of Trieste
Italy, Friuli Venezia Giulia, Trieste, Trieste, Conconello
14/02/2017



Andrea Moro; Owner: Department of Life Sciences, University of Triedte
Italy, Friuli Venezia Giulia, Trieste, Trieste Karst, Rocca di Monrupino
20/02/2017



Andrea Moro; Owner: Department of Life Sciences, University of Triedte
Italy, Friuli Venezia Giulia, Trieste, Trieste Karst, Rocca di Monrupino
20/02/2017



Andrea Moro; Owner: Department of Life Sciences, University of Triedte
Italy, Friuli Venezia Giulia, Trieste, Trieste Karst, Rocca di Monrupino
20/02/2017



Pier Luigi Nimis - CC BY-SA 4.0
TSB 41462



Pier Luigi Nimis - CC BY-SA 4.0
TSB 41462



P.L. Nimis CC BY-SA 4.0
TSB 37998



P.L. Nimis CC BY-SA 4.0
TSB 37998



P.L. Nimis CC BY-SA 4.0
TSB 38272



Pier Luigi Nimis - Department of Life Sciences, University of Trieste - CC BY-SA 4.0
TSB 37386



Pier Luigi Nimis - Department of Life Sciences, University of Trieste - CC BY-SA 4.0
TSB 37386



Pier Luigi Nimis - Department of Life Sciences, University of Trieste - CC BY-SA 4.0
TSB 37387



Pier Luigi Nimis - Department of Life Sciences, University of Trieste - CC BY-SA 4.0
TSB 37387