Arctoparmelia incurva (Pers.) Hale

Mycotaxon, 25: 252, 1986. Basionym: Lichen incurvus Pers. - Ann. Bot. (Usteri), 7: 24, 1794.
Synonyms: Imbricaria incurva (Pers.) DC.; Parmelia incurva (Pers.) Fr.; Xanthoparmelia incurva (Pers.) Hale
Distribution: N - Piem (Isocrono & al. 2004, Isocrono & Piervittori 2008), Emil (Fariselli & al. 2020).
Description: Thallus foliose, closely adnate, yellowish to yellowish green or yellowish grey, usually grey in central parts, rather glossy, sorediate, with elongated, 0.2-1 mm wide, convex, often overlapping and radiating lobes, forming up to 10 cm wide (usually smaller) rosettes, sorediate. Soralia laminal, strongly convex and almost subglobose, most frequent on the central lobes; lower surface pale brown, with sparse, black rhizines. Upper cortex of tightly packed, anticlinally oriented hyphae, with a pored epicortex, the cell walls with Cetraria-type lichenan; medulla white, not amyloid; lower cortex appearing velvety due to minutely papillose hyphae. Apothecia rare, lecanorine, 2-4 mm across, with a brown to brown-black disc and a smooth thalline margin. Epithecium brown; hymenium colourless, I+ blue; paraphyses sparingly branched, the apical cells slightly swollen; 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, ellipsoid, 9-12 x 6-8 μm. Pycnidia rare, laminal immersed, black. Conidia bacilliform, 4-7 μm long. Photobiont chlorococcoid. Spot tests: cortex K-, C-, KC+ yellow, P-; medulla and soralia K-, KC+ pink, P- or P+ rust-red, UV+ bright glaucous blue. Chemistry: cortex with usnic acid; medulla with alectoronic acid and variable amounts of protocetraric and collatolic acids.
Note: a circumpolar, arctic-alpine to boreal-montane species found on steeply inclined, hard, acid siliceous rocks in cold, wind-exposed mountain summits
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: extremely rare
Subalpine belt: extremely rare
Oromediterranean belt: absent
Montane belt: extremely rare
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

Leif Stridvall
Courtesy: Anita Stridvall -Source: http://www.stridvall.se/lichens/gallery/


Triin Aimla; Owner: University of Tartu


Pier Luigi Nimis - CC BY-SA 4.0
Herbarium: TSB 8261



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (8261)
2001/12/18


Leif Stridvall
Courtesy: Anita Stridvall -Source: http://www.stridvall.se/lichens/gallery/


Leif Stridvall
Courtesy: Anita Stridvall -Source: http://www.stridvall.se/lichens/gallery/


Leif Stridvall
Courtesy: Anita Stridvall -Source: http://www.stridvall.se/lichens/gallery/


Leif Stridvall
Courtesy: Anita Stridvall -Source: http://www.stridvall.se/lichens/gallery/


Leif Stridvall
Courtesy: Anita Stridvall -Source: http://www.stridvall.se/lichens/gallery/



Pier Luigi Nimis - CC BY-SA 4.0
TSB 44020