Peltigera degenii Gyeln.

Magyar Bot. Lapok, 25: 253, 1927.
Synonyms: Peltigera canina f. nitens Anders; Peltigera degenii f. nitens (Anders) Oxner; Peltigera degenii var. nitens (Anders) Trass; Peltigera nitens (Anders) Gyeln.; Peltigera polydactylon var. submembranacea Nyl.; Peltigera praetextata var. nitens (Anders) Szatala; Peltigera virescens (J. Steiner) Gyeln.
Distribution: N - Frl (Vitikainen 1994, Tretiach & Molaro 2007), Ven (Vitikainen 1994, Caniglia & al. 1999, Nascimbene 2008c, Nascimbene & al. 2010b, Brackel 2013), TAA (Nascimbene & Caniglia 2000, Nascimbene & al. 2022), Lomb (Vitikainen 1994, Gheza & al. 2022), Piem (Vitikainen 1994, Isocrono & al. 2003, Isocrono & Piervittori 2008), VA (Ravera & al. 2019b), Emil (Tretiach & al. 2008, Fariselli & al. 2020), Lig (Brunialti & al. 1999). C - Tosc (Vitikainen 1994, Benesperi & Tretiach 2004, Benesperi & al. 2007, Benesperi 2011, Brackel 2015), Laz (Herb. Ravera 5053), Mol (Garofalo & al. 1999, Caporale & al. 2008). S - Camp (Garofalo & al. 1999, 2010, Catalano & al. 2016).
Description: Thallus foliose, broad-lobed, heteromerous and dorsiventral, bluish grey when dry, blackish when wet, loosely attached, forming up to 12(-20) cm wide rosettes. Lobes elongate, flattened, contiguous, rounded at tips, 0.5-1 cm broad, 2-5 cm long, with a bluish grey, glossy, shiny, smooth upper surface, the margins often up-turned, sometimes phyllidiate. Lower surface whitish near margins, pale brown in central parts, with whitish, raised veins becoming pale brown towards centre, and pale, simple, up to 5-7 mm long rhizines. Upper cortex pseudoparenchymatous; medulla white; lower cortex absent. Apothecia frequent on up-turned short lobes, saddle-shaped, pale brown. Paraphyses simple, distinctly thickened above. Asci 8-spored, fissitunicate, the thickened apex with a K/I+ blue ring, Peltigera-type, Ascospores 3-5-septate, hyaline turning pale brown at maturity, acicular, thin-walled, (40-)45-60(-68) x 2.5-5 μm. Photobiont cyanobacterial (Nostoc, the cells not in long chains). Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a temperate to southern boreal species found on terricolous bryophytes, on soil rich in humus and on mossy rocks in forests, sometimes on bark in the basal parts of trunks, with optimum in the montane belt; apparently most common in the Eastern Alps and the Northern Apennines.
Growth form: Foliose, broad lobed
Substrata: soil, terricolous mosses, and plant debris
Photobiont: cyanobacteria, filamentous (e.g. Nostoc, Scytonema)
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: extremely rare
Oromediterranean belt: absent
Montane belt: rather rare
Submediterranean belt: extremely rare
Padanian area: absent
Humid submediterranean belt: extremely 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
Index Fungorum GBIF

Einar Timdal - Source: http://nhm2.uio.no/lav/web/index.html - CC BY-NC



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (1849)
2001/12/05
apothecium



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (34836)
2002/02/16



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (34836)
2002/02/16
raised veins on undersurface


Antonio Valero; Owner: Antonio Valero
Spain
2010


Antonio Valero; Owner: Antonio Valero
Spain
2010


Antonio Valero; Owner: Antonio Valero
Spain
2010


Antonio Valero; Owner: Antonio Valero
Spain
2010


Antonio Valero; Owner: Antonio Valero
Spain
2010


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P/Peltigera_degenii.htm
session AFL 2013 dans le Forez - Puy-de-Dôme


Giovanni Barozzi
Italy, Friuli Venezia Giulia, UD, Passo Pura