Calogaya arnoldii (Wedd.) Arup, Frödén & Søchting subsp. arnoldii

Calogaya arnoldii (Wedd.) Arup, Frödén & Søchting subsp. arnoldii

in Arup & al., Nord. J. Bot., 31: 38, 2013. Basionym: Lecanora arnoldii Wedd. - Bull. Soc. Bot. France, 23: 96, 1876.

Synonyms: Amphiloma murorum var. gyalolechioides auct. ital. p.p.; Caloplaca arnoldii (Wedd.) Zahlbr. ex Ginzb. non auct.ital.; Caloplaca biatorina subsp. gyalolechioides auct. p.p.; Caloplaca biatorinoides; Caloplaca saxicola subsp. arnoldii (Wedd.) Clauzade & Cl. Roux non auct.ital.; Caloplaca saxicola subsp. biatorinoides Clauzade & Cl. Roux; Physcia pusilla var. lobulata f. minor Arnold; Placodium murorum f. arnoldii (Wedd.) A.L. Sm.

Distribution: N - VG, Ven, TAA (Nascimbene & al. 2021, 2022). C - Tosc (TSB 34239), Umb (Ravera & al. 2006). Mol (Genovesi & Ravera 2014), Sar.

Description: Thallus crustose-placodioid, episubstratic, forming orbicular, up to 1 cm wide rosettes, yellow-orange to orange (yellow in shade-forms), usually abundantly pruinose. Central part of thallus with 0.3-1.3 mm wide, strongly convex, irregular to elongate areoles formed by lobe fragmentation; marginal lobes convex, irregular or finger-like, slightly broadening at tips, with short and often forked terminal branches, 0.1-1(-1.5) mm long, 0.1-0.6(-0.9) mm wide. Upper cortex with a 6-18.5(-22.5) μm thick, brownish-orange upper layer, and a hyaline (6-)10-45(-50) μm thick internal layer of irregularly arranged hyphae; medulla lax. Apothecia common, pseudolecanorine, more or less crowded, 0.13- 0.7(-0.9) mm across, round or slightly deformed by mutual compression, located either on the areoles or on the lobe bases, sessile to constricted at base. Disk flat to strongly convex, concave in young apothecia, reddish-orange to brownish, somewhat pruinose, smooth; margin paler than disk, without differentiation between proper and thalline margin, slightly pruinose, smooth, 25-100 μm. Epithecium 6-12 μm thick, brownish-orange K+ red; hymenium, subhymenium and hypothecium colourless; paraphyses distinctly septate, forked or subapically branched, often anastomosing, (1.2-)1.5-3.5(-4) μm wide at base, the apical cells (2.5-)3.5-7.5(-8) μm wide. 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, narrowly ellipsoid, (7.5-)9.5-13(-15) x (3.5-)4.5-5.5(-6.5) μm, the equatorial thickening (“septum”) (2-)3-4.5(-5) μm, > 1/3 of spore length. Photobiont chlorococcoid. Spot tests: thallus and apothecia K+ red, C-, KC-, P-. Chemistry: thallus and apothecia with parietin (major), fallacinal, emodin, teloschistin and parietinic acid (minor), corresponding with chemosyndrome A of Søchting (1997).

Note: a well-distinct taxon of the extremely critical C. saxicola-complex, found on steeply inclined surfaces of calciferous rocks (limestone, dolomite, calcareous schists) in open habitats; certainly more widespread in Italy. For further details see Gaya & al. (2001).

Growth form: Crustose placodiomorph

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

In underhangs rarely wetted by rain

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: rare

Oromediterranean belt: very rare

Montane belt: very rare

Submediterranean belt: rather rare

Padanian area: absent

Humid submediterranean belt: rather rare

Humid mediterranean belt: absent

Dry mediterranean belt: absent

pH of the substrata:

1

2

3

4

5

(info)

Solar irradiation:

1

2

3

4

5

(info)

Aridity:

1

2

3

4

5

(info)

Eutrophication:

1

2

3

4

5

(info)

Poleotolerance:

0

1

2

3

(info)

Altitudinal distribution:

1

2

3

4

5

6

(info)

Predictive model

Herbarium samples

Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=1067&lang=en

France, Narbonne Abbaye de Fontfroide

Elena Pittao - CC BY-SA 4.0

Italy, Abruzzo, AQ, Rocca Calascio.
Herbarium: TSB (26383)

Pier Luigi Nimis - CC BY-SA 4.0

TSB 37997

Pier Luigi Nimis - CC BY-SA 4.0

Italy, Trentino-Alto Adige
Herb. J. Nascimbene

Pier Luigi Nimis - CC BY-SA 4.0

Italy, Trentino-Alto Adige
Herb. J. Nascimbene

Pier Luigi Nimis - CC BY-SA 4.0

Italy, Trentino-Alto Adige
Herb. J. Nascimbene

Pier Luigi Nimis - CC BY-SA 4.0

Italy, Trentino-Alto Adige
Herb. J. Nascimbene

P.L. Nimis CC BY-SA 4.0

TSB 9055

Pier Luigi Nimis - CC BY-SA 4.0

Italy, Trentino-Alto Adige
Herb. J. Nascimbene

Pier Luigi Nimis - CC BY-SA 4.0

Italy, Trentino-Alto Adige
Herb. J. Nascimbene

Pier Luigi Nimis - CC BY-SA 4.0

Italy, Trentino-Alto Adige
Herb. J. Nascimbene

Courtesy: Olivier et Danièle Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_C/Textes_C4/Calogaya_arnoldii.htm

France, session AFL 2015 dans le Lot, Blanzaguet

Courtesy: Olivier et Danièle Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_C/Textes_C4/Calogaya_arnoldii.htm

France, session AFL 2015 dans le Lot, Blanzaguet

Courtesy: Olivier et Danièle Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_C/Textes_C4/Calogaya_arnoldii.htm

France, session AFL 2015 dans le Lot, Blanzaguet

Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=1067&lang=en

France, Narbonne Abbaye de Fontfroide

Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=1067&lang=en

France, Narbonne Abbaye de Fontfroide

Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=1067&lang=en

France, Narbonne Abbaye de Fontfroide

Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=1067&lang=en

France, Narbonne Abbaye de Fontfroide

Courtesy: Olivier et Danièle Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_C/Textes_C4/Calogaya_arnoldii.htm

France, session AFL 2015 dans le Lot, Blanzaguet

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