Rhizoplaca chrysoleuca (Sm.) Zopf
Ann. Chemie, 340: 291, 1905. Basionym: Lichen chrysoleucus Sm. - Trans. Linn. Soc. London, 1: 82, 1791.
Synonyms: Lecanora chrysoleuca (Sm.) Ach.; Lecanora chrysoleuca var. pallida Sambo?; Lecanora rubina auct.; Omphalodina chrysoleuca (Sm.) S.Y. Kondr., Lőkös & Farkas; Squamaria chrysoleuca (Sm.) Duby
Description: Thallus foliose-umbilicate, mono- or polyphyllous, to 2-3.5 cm across, pale yellowish green to greenish white, attached by a central holdfast. Lobes flat to concave, c. 0.5-1(-1.5) mm thick, crenate-incised, sometimes partly blackened at margins; lower surface dark brown to black, erhizinate. Upper cortex of strongly gelatinized hyphae, often heavily inspersed with crystals, the cell walls with isolichenan; medulla white, loose, but often filled with granules; lower cortex thicker than the upper one. Apothecia lecanorine, laminal or submarginal, 0.8-2.5 mm across, at first adnate, then sessile and constricted at base, with a flat to convex, reddish orange or yellow-orange, often pruinose disc, and an entire to flexuose-crenate, persistent or excluded thalline margin. Epithecium pale yellowish brown, with a superficial layer of granules; hymenium yellowish, not inspersed, (35-)50-60 µm high; paraphyses c. 2-3 µm thick, with swollen apical cells; hypothecium colourless. Asci 8-spored, clavate, the tholus with a strongly amyloid lateral part, a non-amyloid broadly diverging axial mass with a thick, non-amyloid cap above, and a weakly amyloid outer layer Lecanora-type. Ascospores 1-celled, hyaline, ellipsoid to oblong-ellipsoid, 8-12 x 3-6 µm. Pycnidia rare, black, immersed. Conidia thread-like, 15-20(-30) µm long. Photobiont chlorococcoid. Spot tests: upper cortex K- or K+ yellow, C-, KC+ yellow, P-, UV-; medulla: K-, C- or rarely C+ red, KC-, KC+ pale yellow or rarely KC+ red, P-, or P+ yellow, UV-. Chemistry: upper cortex with usnic acid and variable amounts of either placodiolic or pseudoplacodiolic acid; medulla with aliphatic acids or no substances, or rarely with psoromic and/or lecanoric acids.
Growth form: Foliose, umbilicate
Substrata: rocks
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)
Commonnes-rarity: (info)
Alpine belt: common
Subalpine belt: very common
Montane belt: very rare
Dry submediterranean belt: absent
Humid submediterranean belt: absent
Padanian area: absent
pH of the substrata:
1 2 3 4 5
Solar irradiation:
1 2 3 4 5
Aridity:
1 2 3 4 5
Eutrophication:
1 2 3 4 5
Poleotolerance:
0 1 2 3
Altitudinal distribution:
1 2 3 4 5 6
Rarity
absent
extremely rare
very rare
rare
rather rare
rather common
common
very common
extremely common
Loading data...
Occurrence data
Predictive map
Current prediction (1981-2010)
Future prediction (2071-2100) SSP 1-2.6
Future prediction (2071-2100) SSP 5-8.5Predictive maps according to Francesconi et al. 2025
Pier Luigi Nimis CC BY 4.0
France, Near Mont Cenis
P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (9218)
2001/12/01
P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (9218)
2001/12/01
P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (9218)
2001/12/01
Giancarlo Medici; Owner: Giancarlo Medici
Italy, Alpi Italiane
2010
Juri Nascimbene - CC BY-SA 4.0
Italy, Trentino-Alto Adige, Bolzano/Bozen, Val Mazia
2017
Helena Rodriguez
Spain, Galicia, Peña Trevinca
06.2019
Helena Rodriguez
Spain, Galicia, Peña Trevinca
06.2019
Helena Rodriguez
Spain, Galicia, Peña Trevinca
06.2019
Pier Luigi Nimis - CC BY-SA 4.0
TSB 38510
Pier Luigi Nimis - CC BY-SA 4.0
TSB 38510
Giancarlo Medici; Owner: Giancarlo Medici
Italy, Alpi Italiane
2010
Marko Doboš
Iğdır Merkez/Iğdır, Türkiye
Wolfgang von Brackel - CC BY-4.0
Italy, Piemonte
Wolfgang von Brackel - CC BY-4.0
Italy, Piemonte
Wolfgang von Brackel - CC BY-4.0
Italy, Piemonte
Growth form: Foliose, umbilicate
Substrata: rocks
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)
Commonnes-rarity: (info)
Alpine belt: common
Subalpine belt: very common
Montane belt: very rare
Dry submediterranean belt: absent
Humid submediterranean belt: absent
Padanian area: absent
pH of the substrata:
| 1 | 2 | 3 | 4 | 5 |
Solar irradiation:
| 1 | 2 | 3 | 4 | 5 |
Aridity:
| 1 | 2 | 3 | 4 | 5 |
Eutrophication:
| 1 | 2 | 3 | 4 | 5 |
Poleotolerance:
| 0 | 1 | 2 | 3 |
Altitudinal distribution:
| 1 | 2 | 3 | 4 | 5 | 6 |
Rarity
absent
extremely rare
very rare
rare
rather rare
rather common
common
very common
extremely common
Loading data...
Occurrence data
Predictive map
Current prediction (1981-2010)Future prediction (2071-2100) SSP 1-2.6Future prediction (2071-2100) SSP 5-8.5Predictive maps according to Francesconi et al. 2025
Pier Luigi Nimis CC BY 4.0
France, Near Mont Cenis
P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (9218)
2001/12/01
P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (9218)
2001/12/01
P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (9218)
2001/12/01
Giancarlo Medici; Owner: Giancarlo Medici
Italy, Alpi Italiane
2010
Juri Nascimbene - CC BY-SA 4.0
Italy, Trentino-Alto Adige, Bolzano/Bozen, Val Mazia
2017
Helena Rodriguez
Spain, Galicia, Peña Trevinca
06.2019
Helena Rodriguez
Spain, Galicia, Peña Trevinca
06.2019
Helena Rodriguez
Spain, Galicia, Peña Trevinca
06.2019
Pier Luigi Nimis - CC BY-SA 4.0
TSB 38510
Pier Luigi Nimis - CC BY-SA 4.0
TSB 38510
Giancarlo Medici; Owner: Giancarlo Medici
Italy, Alpi Italiane
2010
Marko Doboš
Iğdır Merkez/Iğdır, Türkiye
Wolfgang von Brackel - CC BY-4.0
Italy, Piemonte
Wolfgang von Brackel - CC BY-4.0
Italy, Piemonte
