Xanthoparmelia mougeotii (Schaer. ex D. Dietr.) Hale

Phytologia, 28: 488, 1974. Basionym: Parmelia mougeotii Schaer. ex D. Dietr. - Deutsch. Krypt. Gew., 4: 118, 1846.
Synonyms: Parmelia conspersa var. quarzicola Moug.; Parmelia discreta (Nyl.) Nyl.; Xanthoparmelia mougeotii (Schaer.) Hale
Distribution: N - Lomb (TSB 6840), VA (Piervittori & Isocrono 1999, Giordani & al. 2002b), Emil (Giordani & al. 2002b, Fariselli & al. 2020). C - Marc (Giordani & al. 2002b), Sar (Nöske 2000, Giordani & al. 2002b).
Description: Thallus foliose (subcrustose-areolate in central parts), heteromerous, dorsiventral, closely adnate, yellowish green in peripheral parts, greyish in central parts, more or less glossy, forming 0.5-2(-4) cm wide rosettes. Lobes sublinear, elongate, (0.2-)0.5-1(-1.5) mm wide, smooth to rugulose, sometimes transversely cracked with age, epruinose and emaculate, sorediate, the soredia farinose, arramged in orbicular, capitate, 0.5-1 mm wide, yellowish white soralia. Lower surface brownish black, with dark brown to black, simple, 0.1-0.2 mm long rhizines. Upper cortex paraplectenchymatous, with a pored epicortex, the cell walls with Xanthoparmelia-type lichenan; medulla white; lower cortex paraplectenchymatous. Apothecia very rare, lecanorine, with a brown to dark brown disc and a smooth thalline margin. Epithecium brown; hymenium and hypothecium colourless; paraphyses simple; hypothecium colourless. Asci 8-spored, clavate, the K/I+ blue tholus penetrated by a faintly amyloid apical cushion with parallel or diverging flanks, the wall K/I-, surrounded by a K/I+ blue outer layer, Lecanora-type. Ascospores 1-celled, hyaline, broadly ellipsoid, (6-)7-9(-11) x 4-6 µm. Pycnidia rare, laminal immersed, black. Conidia weakly dumbbell-shaped, 4-6 x c. 1 µm. Photobiont chlorococcoid. Spot tests: upper cortex K-, C-, KC+ pale yellow, P-, UV-; medulla and soralia K+ orange, C-, KC+ orange, P+ orange, UV-. Chemistry: upper cortex with usnic acid (major); medulla with stictic acid (major), constictic and norstictic acids (both minor), and traces of cryptostictic and peristictic acids.
Note: a mainly boreal-montane, circumpolar species found on hard siliceous rocks, often near the ground, e.g. on pebbles; probably more widespread in the Alps, but never common.
Growth form: Foliose, narrow lobed
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: rare
Oromediterranean belt: extremely rare
Montane belt: very rare
Submediterranean belt: very rare
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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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model
Herbarium samples
Index Fungorum GBIF

Leif Stridvall - Source: http://www.stridvall.se/la/galleries.php


Andres Saag; Owner: University of Tartu



Curtis Randall Björk, - CC BY-SA 4.0
Campus of Royal Roads University, Victoria, British Columbia, Canada Canada
2017


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_X/Xanthoparmelia_mougeotii.htm
France, sur basalte - Lac de Salagou - Hérault


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_X/Xanthoparmelia_mougeotii.htm
France, sur basalte - Lac de Salagou - Hérault


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=368&lang=en
France, Commana


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=368&lang=en
France, Ile Vierge


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=368&lang=en
France, Ile Vierge


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=368&lang=en
France, Pointe de Pen-Hir


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=368&lang=en
France, Commana


Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=368&lang=en
France, Ardennes


Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=368&lang=en
France, Ardennes


Michel David - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=368&lang=en
France, Roc'h Trédudon