Peltigera kristinssonii Vitik.

Ann. Bot. Fenn., 22: 291, 1985.
Synonyms: Peltigera occidentalis sensu Kristinsson
Distribution: N - Lomb (Vitikainen 1994, in Switzerland, near the border), Piem (Matteucci & al. 2015b), VA (Vitikainen 1994, in France, near the border). C - Marc (Nimis & Tretiach 1999).
Description: Thallus foliose, heteromerous and dorsiventral, broad-lobed, grey-brown to brown, often with a yellowish hue when dry, blackish green when wet, loosely attached, forming up to 10 cm wide rosettes. Lobes elongated, flattened, contiguous, with rounded ends, 1-1.5 cm wide, 5-7 cm long, with an erect tomentum in marginal parts, glabrescent in central parts, smooth or mostly somewhat scabrous, with up-turned margins. Lower surface with dark, flat veins coated with a dark tomentum; interstices between veins white and lenticular; rhizines fasciculate, tufted or slightly confluent, 3-4 mm long, dark brown to black, squarrosely branched. Upper cortex pseudoparenchymatous; medulla white; lower cortex absent. Apothecia frequent, terminal on ascending lobes, saddle-shaped, 8-10 mm across, with a brown disc. 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 to pale brown at maturity, acicular, thin-walled, (40-)44-59(-73) x 3-4(-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 slightly calciphilous species, probably more widespread, both in the Alps and the Apennines, with optimum near treeline.
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: very rare
Subalpine belt: rare
Oromediterranean belt: absent
Montane belt: absent
Submediterranean belt: absent
Padanian area: absent
Humid submediterranean belt: absent
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 (23693)
2003/03/03



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (23693)
2003/03/03
rhizines


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_4/Peltigera_kristinssonii.htm
France, 22/7/2014 - Restefond, alt. 2600 m, Jausiers - Alpes-de-Haute-Provence -


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_4/Peltigera_kristinssonii.htm
France, 22/7/2014 - Restefond, alt. 2600 m, Jausiers - Alpes-de-Haute-Provence -


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_4/Peltigera_kristinssonii.htm
France, 22/7/2014 - Restefond, alt. 2600 m, Jausiers - Alpes-de-Haute-Provence -