Peltigera aphthosa (L.) Willd.

Fl. Berolin. Prodr.: 347, 1787. Basionym: Lichen aphthosus L. - Sp. Pl., 2: 1148, 1753.
Synonyms: Lichen verrucosus Weber; Peltidea aphthosa (L.) Ach.; Peltidea aphthosa var. verrucosa Ach.; Peltigera aphthosa var. microthallina Gyeln.; Peltigera aphthosa var. phymatodes Wallr.
Distribution: N - Frl (Tretiach & Hafellner 2000, Nardini & al. 2013), Ven (Vitikainen 1994, Caniglia & al. 1999, Nascimbene & Caniglia 2003c), TAA (Vitikainen 1994, Caniglia & al. 2002, Nascimbene & al. 2005, 2006, 2008c, 2022, Nascimbene 2008b), Lomb (Anzi Lich. Lang. 458: Vitikainen 1994, Dalle Vedove & al. 2004, Gheza 2019, 2019b, Gheza & al. 2022), Piem (Vitikainen 1994, Isocrono & al. 2003, 2004, Morisi 2005), VA (Rivellini 1994, Vitikainen 1994, Borlandelli & al. 1996, Piervittori & Isocrono 1997, 1999, Piervittori & al. 2001, Valcuvia 2000), Emil (Dalle Vedove & al. 2002, Benesperi & al. 2007, Fariselli & al. 2020), Lig (Brunialti & al. 1999). C - Tosc (Benesperi & al. 2007), Marc, Abr (Nimis & Tretiach 1999).
Description: Thallus foliose, heteromerous and dorsiventral, broad-lobed, loosely attached, forming 15(-24) cm wide rosettes. Lobes elongate, concave, contiguous, 1.5-3(-5) cm broad, up to 12 cm long, usually obtuse to boat-shaped, with ascending, entire to crenate margins. Upper surface grey to greenish-grey when dry, bright green when wet, smooth, with up to 2 mm wide, numerous, scattered, dark grey, flattened to warty cephalodia containing Nostoc. Lower surface tomentose, whitish in marginal parts, abruptly blackening in central parts, with a few, indistinct, broad veins, or without veins, and with a few dark, simple to fasciculate, often confluent rhizines. Upper cortex pseudoparenchymatous; medulla white; lower cortex absent. Apothecia rare, saddle-shaped, terminal, brown, with a continuous, smooth to warty cortex. Paraphyses simple, distinctly thickened in upper part. Asci 8-spored, fissitunicate, the thickened apex with a K/I+ blue ring, Peltigera-type. Ascospores 3-7-septate, hyaline to pale brown at maturity, acicular, thin-walled, (47-)53-67(-75) x 4-5 μm. Photobiont chlorococcoid (Coccomyxa), cephalodia with Nostoc. Spot tests: K-, C-, KC-, P-, UV-; or medulla faintly and fleeting C+ and KC+ pink. Chemistry: five chemotypes with different combinations of tenuiorin, methyl gyrophorate, gyrophoric acid and triterpenoids.
Note: a mainly boreal-montane, circumpolar acidophytic vicariant of P. leucophlebia, found on terricolous mosses and soil rich in humus, mostly in forests but also above treeline; common in the Alps, much rarer in the Apennines. The record from Campania reported by Nimis (1993: 496) is dubious, and probably refers to P. leucophlebia.
Growth form: Foliose, broad lobed
Substrata: soil, terricolous mosses, and plant debris
Photobiont: green algae other than Trentepohlia (primary); cyanobacteria, filamentous (e.g. Nostoc, Scytonema) (secundary, e.g. in cephalodia)
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: rather rare
Subalpine belt: common
Oromediterranean belt: very rare
Montane belt: rather common
Submediterranean belt: absent
Padanian area: absent
Humid submediterranean belt: absent
Humid mediterranean belt: absent
Dry mediterranean belt: absent

pH of the substrata:

12345

(info)

Solar irradiation:

12345

(info)

Aridity:

12345

(info)

Eutrophication:

12345

(info)

Poleotolerance:

0123

(info)

Altitudinal distribution:

123456

(info)


Predictive model
Herbarium samples
Index Fungorum GBIF

Andres Saag; Owner: University of Tartu



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (8707)
2001/12/05
lower surface



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (21158)
2003/03/03
upper surface with cephalodia (wet)



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (21158)
2003/03/03
cephalodium (wet)



Felix Schumm – CC BY-SA 4.0
[12666], Österreich, Gauertal, Lindauer Hütte, ca. 1900 m, Krummholz. Leg. et det. H. Muhle 09.2005.



Felix Schumm – CC BY-SA 4.0
[12666], Österreich, Gauertal, Lindauer Hütte, ca. 1900 m, Krummholz. Leg. et det. H. Muhle 09.2005.



Felix Schumm – CC BY-SA 4.0
[12666], Österreich, Gauertal, Lindauer Hütte, ca. 1900 m, Krummholz. Leg. et det. H. Muhle 09.2005.



Felix Schumm – CC BY-SA 4.0
[12666], Österreich, Gauertal, Lindauer Hütte, ca. 1900 m, Krummholz. Leg. et det. H. Muhle 09.2005.
HPTLC in den Laufmitteln A, B’ und C nach Säurebehandlung bei Tageslicht und 366 nm UV-Langwelle. 1: Start, 4: Position von Norstictinsäure, 7: Position von Atranorin, t: Tenuiorin, mg: Methylgyrophorat, ph: phlebic acid B.



Juri Nascimbene - CC BY-SA 4.0
Stelvio National Park, Reg. Trentino-Alto Adige Prov. Trento, Italy.
07.2005



Juri Nascimbene - CC BY-SA 4.0
Stelvio National Park, Reg. Trentino-Alto Adige Prov. Trento, Italy.
07.2005


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_2/Peltigera_aphtosa.htm
France, 4/8/2010 - Champagny-le-Haut - Haute-Savoie