Dendrographa decolorans (Sm.) Ertz & Tehler

Fungal Divers., 49: 53, 2011. Basionym: Spiloma decolorans Turner & Borrer ex Sm. in Smith & Sowerby - Engl. Bot.: 34, tab. 2399, 1812.
Synonyms: Arthonia decolorans (Sm.) Erichsen; Lepraria decolorans (Sm.) Almb.; Opegrapha albocincta Nyl.; Opegrapha pitardii B. de Lesd.; Schismatomma albocinctum (Nyl.) Zahlbr.; Schismatomma decolorans (Sm.) Clauzade & Vězda; Schismatomma pitardii (B. de Lesd.) Torrente & Egea
Distribution: N - VG, Frl (TSB 5609), Emil (Nimis & al. 1996, Fariselli & al. 2020), Lig (Tehler 1993, Giordani & al. 2001, 2002, Brunialti & Giordani 2003, Giordani 2006, Giordani & Incerti 2008). C - Tosc (Loppi & al. 1999a, 2004c, Putortì & Loppi 1999, Senese & Critelli 2000, Laganà & al. 2002, Stofer 2006, Brunialti & Frati 2010, Brunialti & al. 2012b, Paoli & al. 2012, Benesperi & al. 2013), Umb (Ravera 2000, Ravera & al. 2006), Laz (Tehler 1993, Ravera & al. 1999, 2003, Massari & Ravera 2002, Stofer 2006, Munzi & al. 2007, Ravera 2008b, Zucconi & al. 2013), Abr (Caporale & Pagliani 2010, 2014), Mol (Paoli & al. 2015), Sar (Tehler 1993, Zedda 2002, 2002b, Cossu 2013). S - Camp (Aprile & al. 2003b, Nimis & Tretiach 2004, Garofalo & al. 2010), Pugl (Nimis & Tretiach 1999, Brackel 2011), Bas (Bartoli & Puntillo 1998, Potenza 2006, Potenza & al. 2010), Cal (Puntillo 1995, 1996, Puntillo & Puntillo 2004, 2012, Incerti & Nimis 2006), Si (Grillo & al. 2009b, Ottonello & al. 2011).
Description: Thallus crustose, rather thin, more or less cracked, sometimes delimited by a grey-black prothallus, several thalli often merging to cover very large surfaces, pale grey, to pale grey-brown, often with a characteristic violet or lilac tinge (which disappears in herbarium). Soralia first punctiform, then rapidly confluent, concolourous with or slightly paler than thallus, the farinose soredia often abuindant and giving the thallus a subleprose appearance. Apothecia very rare, elongate to almost circular, 0.8-1.3 mm wide, with a convex, persistently pruinose disc. Epithecium brown; hymenium colourless; hamathecium of branched and anastomosing paraphysoids; hypothecium dark brown. Asci clavate, bitunicate, thickened at apex, with an internal K/I+ blue ring. Ascospores 1-septate, hyaline, fusiform, curved, 30-37 x 4-5 µm. Pycnidia rare, black, immersed. Conidia bacilliform, straight o slightly curved, 1-septate, hyaline to pale brown, 6-7 x c. 2 µm. Photobiont trentepohlioid. Spot tests: K-, C-, KC-, P-. Chemistry: unidentified fatty acids.
Note: a mild-temperate, mostly western species found on ancient oaks in northern Italy, but most abundant in Tyrrhenian Italy (e.g. on orange-trees along the Amalfi coast). The fertile, non-sorediate morph previously called Schismatomma albocinctum is genetically identical to the sorediate morph (Ertz & Tehler 2011); it has a Mediterranean-Atlantic distribution, and is found on bark of Pinus, Juniperus, Pistacia and other shrubs in maritime, very humid situations, being much rarer than the typical, sorediate form.
Growth form: Crustose
Substrata: bark
Photobiont: Trentepohlia
Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)
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: absent
Submediterranean belt: very rare
Padanian area: extremely rare
Humid submediterranean belt: rather common
Humid mediterranean belt: common
Dry mediterranean belt: absent


pH of the substrata:

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Poleotolerance:

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Altitudinal distribution:

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P.L. Nimis CC BY-SA 4.0
TSB 23165



P.L.Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (38348)
2008.02.25



P.L.Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (38346)
2008.02.25



P.L.Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (23165)
2008.03.06



P.L.Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (23165)
2008.03.06



P.L. Nimis CC BY-SA 4.0.
TSB 32175



P.L.Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (38348)
2008.02.25