Acarospora nodulosa (Dufour) Hue var. nodulosa

Nouv. Arch. Mus. Hist. Nat. Paris, 5 sér., 1: 160, 1909. Basionym: Parmelia nodulosa Dufour in Fries - Lich. Eur. Ref.: 185, 1831.
Synonyms: Lecanora nodulosa (Dufour) Colmeiro nom. illegit. non Stirt.; Urceolaria nodulosa (Dufour) Schaer.
Distribution: N - Emil (Nimis & al. 1996, Fariselli & al. 2020).
Description: Thallus areolate-subsquamulose, densely chalk-white-pruinose, forming patches to 5 cm diam. Areoles (2-)3-5(-6) mm wide, 0.2-2 mm thick, rounded, mostly convex, slightly lobed; lower surface attached by a few rhizines. Cortex densely filled with crystals visible under polarized light; algal layer continuous; medulla filled with crystals. Apothecia lecanorine, 1-2(-3) mm across, round, at first immersed, later sessile, with a flat to slightly convex, dark brown to almost black, epruinose disc, and a thick thalline margin. Epithecium yellowish brown, K+ yellow turning red (acicular crystals); hymenium colourless, 50-180 μm high, I+ blue; paraphyses coherent, simple to sparingly banched in upper part, 1.5-2.5 μm thick at base, the apical cell slightly swollen; hypothecium colourless, 40-85 μm tall, K+ yellow turning red (acicular crystals). Asci c. 100-spored. clavate, with a distinct apical dome, I . Ascospores 1-celled, hyaline globose or subglobose, 3-6 x 3-7 μm in diam. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-. Chemistry: apothecia with norstictic acid.
Note: a xeric subtropical species of weathered gypsum in open habitats, usually below the montane belt. To be looked for in other gypsum outcrops (e.g. in Sicilia).
Growth form: Crustose
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Subcontinental: restricted to areas with a dry-subcontinental climate (e.g. dry Alpine valleys, parts of Mediterranean Italy)
paras Diploschistes diacapsis

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: absent
Submediterranean belt: extremely rare
Padanian area: absent
Humid submediterranean belt: absent
Humid mediterranean belt: absent
Dry mediterranean belt: absent


pH of the substrata:

(info)

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5

Solar irradiation:

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5

Aridity:

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Eutrophication:

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Poleotolerance:

(info)

0

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Altitudinal distribution:

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5




Antonio Valero; Owner: Antonio Valero
Spain
2010



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (9444)
2001/11/21


Antonio Valero; Owner: Antonio Valero
Spain
2010


Antonio Valero; Owner: Antonio Valero
Spain
2010


Antonio Valero; Owner: Antonio Valero
Spain
2010


Antonio Valero; Owner: Antonio Valero
Spain
2010


Antonio Valero; Owner: Antonio Valero
Spain
2010


Antonio Valero; Owner: Antonio Valero
Spain
2010



Felix Schumm – CC BY-SA 4.0
Image from: F. Schumm (2008) - Flechten Madeiras, der Kanaren und Azoren. Beck, OHG - ISBN: 978-3-00-023700-3



Felix Schumm - CC BY-SA 4.0
Image from: F. Schumm (2008) - Flechten Madeiras, der Kanaren und Azoren. Beck, OHG - ISBN: 978-3-00-023700-3



Felix Schumm - CC BY-SA 4.0
Image from: F. Schumm (2008) - Flechten Madeiras, der Kanaren und Azoren. Beck, OHG - ISBN: 978-3-00-023700-3