Leptogium saturninum (Dicks.) Nyl.

Act. Soc. Linn. Bordeaux, 21: 272, 1856. Basionym: Lichen saturninus Dicks. - Fasc. Pl. Crypt. Brit., 2: 21, 1790.
Synonyms: Collema myochroum (Ehrh.) Rabenh.; Collema saturninum (Dicks.) DC.; Leptogium myochroum (Ehrh.) Nyl.; Mallotium saturninum (Dicks.) Gray; Mallotium tomentosum (Hoffm.) Körb.
Distribution: N - Frl, Ven (Nascimbene & Caniglia 2003c, Nascimbene 22011), TAA (Nascimbene & Caniglia 2000b, Nascimbene & al. 2005, 2006, 2007b, 2014, Thor & Nascimbene 2007, Obermayer 2011b, Nascimbene 2014, Nimis & al. 2015), Lomb (Gheza 2017, 2019), Piem (Isocrono & al. 2004), VA (Borlandelli & al. 1996, Piervittori & Isocrono 1997, 1999, Ongaro & al. 2022), Emil (Fariselli & al. 2020), Lig. C - Tosc (Tretiach & Nimis 1994, Benesperi & al. 2007, Benesperi 2011, Brackel 2015), Marc (Nimis & Tretiach 1999), Umb (Ravera 1998, Ravera & al. 2006, Brackel 2015, Laz (Ravera 2001), Abr (Olivieri & Pacioni 1996, Olivieri & al. 1997, 1997b, Loppi & al. 1999, Nimis & Tretiach 1999, Brackel 2015, Corona & al. 2016, Di Nuzzo & al. 2021, Gheza & al. 2021), Mol (Caporale & al. 2008, Brackel 2020), Sar. S - Camp (Ravera & Brunialti 2013), Pugl, Bas (Potenza 2006, Potenza & Fascetti 2010, 2012), Cal (Puntillo 1995, 1996, Incerti & Nimis 2006), Si (Brackel 2008b, Campisi & al. 2020).
Description: Thallus foliose, broad-lobed, homoiomerous, 2-8(-10) cm in diam., adnate. Lobes irregular, elongate, plane to concave, separate, 5-20 mm wide, 100-200(-300) µm thick; apices rotund, entire to irregularly cut and isidiate, occasionally upturned, Upper surface dark olivaceous grey to almost black, usually dull, not much wrinkled, homogeneously covered with scattered to dense, granular to subcylindrical, black isidia which are usually darker than the thallus. Upper and lower cortices consisting of a single layer of irregularly isodiametrical cells, internally with loosely interwoven chains of Nostoc and hyphae. Lower surface pale to medium brown, wrinkled, covered in a dense white tomentum of cylindrical hairs (to 0.2 mm long), with long-cylindrical cells. Apothecia very rare, laminal, sessile, 0.5-2.5 mm wide, with a brown disc and a smooth to granulose-isidiate thalline margin. True exciple euparaplectenchymatous; hymenium colourless below, thinly brown in upper part; paraphyses simple, 1-2 µm wide, slightly inflated apically; subhymenium pale yellow. Asci 8-spored, cylindrical-clavate, the apex thick, with a I+ blue apical dome and a I+ blue annulus projecting downwardly. Ascospores hyaline, submuriform, 3-4-septate transversely, 1-septate longitudinally, ellipsoid to subfusiform, 20-25 x 7-10 µm. Photobiont cyanobacterial (Nostoc), in long chains. Spot tests: all negative. Chemistry: without lichen substances.
Note: a cool-temperate to boreal-montane, circumpolar lichen found on bark, rarely on mossy rocks, only locally common, especially in upland areas. The recent record from Tuscany by Pasquinelli & al. (2009), judging from the picture, is most probably wrong and is not accepted here. See also note on L. burnetiae.
Growth form: Foliose, broad lobed
Substrata: bark
Photobiont: cyanobacteria, filamentous (e.g. Nostoc, Scytonema)
Reproductive strategy: mainly asexual, by isidia, or isidia-like structures (e.g. schizidia)
Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: extremely rare
Oromediterranean belt: absent
Montane belt: rare
Submediterranean belt: extremely rare
Padanian area: absent
Humid submediterranean belt: very rare
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 4.0
TSB 2539


Triin Aimla; Owner: University of Tartu



P.L.Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (37009)
2008.02.28



E. Pittao; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (5239)
2008.03.10
lower surface



E. Pittao; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (33327)
2008.04.02


Zahlbruckner A. 1926. Lichenes (Flechten). In: Engler A. (ed.): Die natürlichen Pflanzenfamilien. 2nd ed., vol 8, W. Engelmann, Leipzig, 270 pp.


Zahlbruckner A. 1926. Lichenes (Flechten). In: Engler A. (ed.): Die natürlichen Pflanzenfamilien. 2nd ed., vol 8, W. Engelmann, Leipzig, 270 pp.



P.L. Nimis CC BY-SA 4.0
TSB 2539



P.L. Nimis CC BY-SA 4.0
TSB 2539


Andres Saag; Owner: University of Tartu



P.L. Nimis CC BY-SA 4.0
TSB 37334



P.L. Nimis CC BY-SA 4.0
TSB 37334



P.L. Nimis CC BY-SA 4.0
TSB 37333



P.L. Nimis CC BY-SA 4.0
TSB 38741


Walter Obermayer CC BY-SA 4.0 - Source: Lichens of Noricum - http://lichens-of-noricum.uni-graz.at/


Walter Obermayer CC BY-SA 4.0 - Source: Lichens of Noricum - http://lichens-of-noricum.uni-graz.at/


Walter Obermayer CC BY-SA 4.0 - Source: Lichens of Noricum - http://lichens-of-noricum.uni-graz.at/


Walter Obermayer CC BY-SA 4.0 - Source: Lichens of Noricum - http://lichens-of-noricum.uni-graz.at/