Xanthomendoza oregana (Gyeln.) Søchting, Kärnefelt & S.Y. Kondr.

Mitt. Inst. allg. Bot. Hamburg, 30-32: 237, 2002. Basionym: Xanthoria oregana Gyeln. - Rev. Bryol. Lichénol., n.s., 5: 33, 1932.
Synonyms: Xanthomendoza poeltii (S.Y. Kondr. & Kärnefelt) Søchting; Xanthoria poeltii S.Y. Kondr. & Kärnefelt
Distribution: N - Piem (Bertrand 2021), Lig (LD-1400315).
Description: Thallus foliose to subfruticose, heteromerous, dorsiventral, bright yellow to light orange, forming small to medium-sized, up to 3 cm wide tufts which often merge to cover larger surfaces. Lobes flattened to concave, slightly raised to ascending, 0.4-1 mm wide, smooth or slightly wrinkled, the tips with fine branchlets; soredia granular, orange, in marginal to submarginal soralia. Lower surface white, smooth to somewhat wrinkled, often with white, scattered rhizines. Upper and lower cortex paraplectenchymatous; medulla white. Apothecia very rare, lecanorine, laminal, stipitate, up to 3.5 mm across, with an orange disc and an often sorediate thalline margin. Thalline exciple paraplectenchymatous; proper exciple a strongly gelatined plectenchyma with unoriented, short-celled hyphae; epithecium orange-brown, c. 10 µm high, K+ purple-red; hymenium colourless, 70-90 µm high; paraphyses simple or rarely branched, septate; hypothecium colourless or pale orange-brown, 25-40 µm high. Asci 8-spored, clavate, functionally unitunicate, apically thickened with a broad internal beak, the inner part of apex and external cap I+ blue, Teloschistes-type. Ascospores 2-celled, polarilocular, hyaline, ellipsoid, 16-17 x 7-9 µm, the equatorial thickening (“septum”) 6-7 µm. Pycnidia immersed, coloured as upper surface. Conidia variable, ellipsoid to bacilliform within the same pycnidium. Photobiont chlorococcoid. Spot tests: thallus and apothecia K+ purple-red, C-, KC-, P-, UV+ orange. Chemistry: parietin (major), fallacinal, emodin, teloschistin and parietinic acid (chemosyndrome A of Søchting 1997).
Note: mainly epiphytic, this recently-resurrected species was frequently confused with X. ulophyllodes and/or X. fulva.
Growth form: Foliose, narrow lobed
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)
Subcontinental: restricted to areas with a dry-subcontinental climate (e.g. dry Alpine valleys, parts of Mediterranean Italy)

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
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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Aridity:

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model
Index Fungorum GBIF

Michel Bertrand
Pontechianale, Piemonte, Italy


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


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


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


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


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



Curtis Randall Björk – CC BY-SA 4.0
Sooke Regional Park, southern Vancouver Island, near Victoria Date: 2011-11-09 Saxicolous, on rock shortly above high tide, sheltered site