Ochrolechia pallescens (L.) A. Massal.

N. Ann. Sc. Nat. Bologna, 7: 212, 1853. Basionym: Lichen pallescens L. - Sp. Pl.: 1142, 1753.
Synonyms: Lecanora pallescens (L.) Röhl. non A. Massal.; Lecanora pallescens var. corticola A. Massal.; Lecanora parella f. nivea Cromb.; Ochrolechia anomala (Harm.) Verseghy; Ochrolechia pallescens f. coronata Verseghy; Ochrolechia pallescens f. nivea (Cromb.) Verseghy; Ochrolechia pallescens f. pulverulenta Verseghy; Ochrolechia parella subsp. pallescens (L.) Clauzade & Cl. Roux; Ochrolechia parella var. corticola (A. Massal.) Kieff.; Ochrolechia parella var. tumidula auct. non (Pers.) Arnold; Ochrolechia tumidula auct. non (Pers.) Arnold
Distribution: N - VG, Frl, Ven (Lazzarin 2000b, Nascimbene & Caniglia 2003c), TAA (Nascimbene & al. 2007b, Nimis & al. 2015), Lomb (Abramini & al. 2008), Piem (Isocrono & Falletti 1999, Isocrono & al. 2003), VA (Valcuvia 2000), Emil (Tretiach & al. 2008, Fariselli & al. 2020), Lig (Brunialti & al. 1999, Kukwa 2011). C - Tosc (Benesperi & al. 2007, Brunialti & Frati 2010, Benesperi 2011, Nascimbene & al. 2015), Marc (Nimis & Tretiach 1999), Umb (Ravera 1998, Nimis & Tretiach 1999, Ravera & al. 2006), Laz (Bartoli & al. 1997, Massari & Ravera 2002, Ravera 2006c), Abr (Nimis & Tretiach 1999, Stofer 2006, Kukwa 2011, Zucconi & al. 2013, Caporale & al. 2016, Corona & al. 2016, Gheza & al. 2021), Mol (Garofalo & al. 1999, Caporale & al. 2008, Genovesi & Ravera 2014, Brackel 2020), Sar (Zedda 1995, 2002, 2002b, Loi & al. 2000, Kukwa 2011, Rizzi & al. 2011, Neuwirth 2018, Brackel & Berger 2019). S - Camp (Garofalo & al. 1999, 2010, Aprile & al. 2002, 2003, 2003b, Nimis & Tretiach 2004, Brunialti & al. 2013, Ravera & Brunialti 2013, Catalano & al. 2016), Pugl (Garofalo & al. 1999, Durini & Medagli 2004), Bas (Nimis & Tretiach 1999, Potenza 2006, Kukwa 2011, Brackel 2011), Cal (Puntillo 1996, Incerti & Nimis 2006), Si (Nimis & al. 1996b, Ottonello & Salone 1994, Ottonello & al. 1994, 2011, Grillo & Cristaudo 1995, Grillo & al. 1996, Ottonello & Romano 1997, Schicchi & al. 1997, Grillo 1998, Grillo & Caniglia 2004, 2006, Merlo 2004b, Falco Scampatelli 2005, Stofer 2006, Campisi & al. 2020).
Description: Thallus crustose, rather thick (0.5-2 mm), smooth to wrinkled or areolate, dull, whitish, ochre-grey or pale brown, forming patches to 5 cm across (usually less). Apothecia lecanorine, round to (more rarely) irregular, 1-3 mm across, with a flat, pink-ochre, finely white-pruinose disc and a very thick, smooth, prominent thalline margin. Cortex of the thalline margin well developed, in upper part up to 70 μm, with a well differentiated medulla; proper exciple well visible in section, superficially often forming a ring around disc; hymenium colourless, 250-300 μm tall; paraphyses thin, densely branched and anastomosed; hypothecium colourless to yellowish. Asci (4-)6-8-spored, with thick, amyloid walls, Pertusaria-type. Ascospores 1-celled, hyaline, broadly ellipsoid, (35-)45-70(-75) x (12-)25-40 µm. Photobiont: chlorococcoid. Thallus: K-, C- or C+ yellow, KC+ yellow, P-; disc of apothecia KC+ carmine red. Chemistry: gyrophoric and lecanoric acid in the epithecium, variolaric acid in thallus, occasionally with the murolic acid complex and alectoronic acid.
Note: a mainly temperate species found on deciduous trees in humid areas. The relationships with O. parella remain to be clarified: the two species are similar, but have a different ecology and distribution, and they hardly can be treated as formae of one and the same species.
Growth form: Crustose
Substrata: bark
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)

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: rare
Submediterranean belt: extremely rare
Padanian area: absent
Humid submediterranean belt: very rare
Humid mediterranean belt: extremely rare
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 4.0
TSB 9227



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (9227)
2001/11/27



Felix Schumm – CC BY-SA 4.0
Image from: F. Schumm (2008) - Flechten Madeiras, der Kanaren und Azoren. Beck, OHG - ISBN: 978-3-00-023700-3


Manuel Gil
Spain, Canary Islands, Lanzarote


Manuel Gil
Spain, Canary Islands, Lanzarote


Leif Stridvall - Source: http://www.stridvall.se/la/galleries.php