Lecanora circumborealis Brodo & Vitik.
Mycotaxon, 21: 288, 1984.
Synonyms: Lecanora coilocarpa auct. non (Ach.) Nyl.
Description: Thallus crustose, continuous or rimose, yellowish white to pale grey, sometimes delimited by a bluish black prothallus. Apothecia lecanorine, mostly sessile, 0.4-1(-1.5) mm across, with a brown to blackish brown, flat to slightly convex disc, and a usually smooth, persistent thalline margin. Thalline exciple corticate, the cortex very thick, 20-40 µm laterally, 35-65(-90) µm at base, the medulla with numerous algal cells and with large crystals insoluble in K; proper exciple colourless, lacking crystals; epithecium brown to dark brown, the pigment dissolving in K, with small crystals (<1 μm wide) soluble in K but not in N, penetrating into the epithecium for c. 20 μm, pulicaris-type; hymenium colourless, not inspersed with oil droplets; paraphyses slightly thickened at apex; hypothecium colourless, without oil droplets. Asci 8-spored, clavate, very thin-walled, with a K/I+ blue, tall tholus penetrated by a faintly amyloid apical cushion, the wall K/I-, surrounded by a blue outer layer, Lecanora-type. Ascospores 1-celled, hyaline, broadly ellipsoid, (11-)13-18 x (7-)8-12 µm, the wall 1-1.2 µm thick. Photobiont chlorococcoid. Spot tests: K+ yellow, C-, KC-, P- or P+ pale yellow. Chemistry: atranorin (major), chloratranorin and roccellic acid.
Growth form: Crustose
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Commonnes-rarity: (info)
Alpine belt: absent
Subalpine belt: common
Montane belt: rather common
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
P.L. Nimis CC BY-SA 4.0
TSB 38804
Pier Luigi Nimis CC BY-SA 4.0
TSB 38804
Pier Luigi Nimis CC BY-SA 4.0
TSB 38806
P.L. Nimis CC BY-SA 4.0
TSB 38804
Pier Luigi Nimis - CC BY-SA 4.0
TSB 43932
Leif Stridvall - Source: http://www.stridvall.se/la/galleries.php . Courtesy: A. Stridvall
P.L. Nimis CC BY-SA 04
TSB 13736
Walter Obermayer CC BY-SA 4.0 - Source: Lichens of Noricum - http://lichens-of-noricum.uni-graz.at/
Walter Obermayer CC BY-SA 4.0 - Source: Lichens of Noricum - http://lichens-of-noricum.uni-graz.at/
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_5/Lecanora_circumborealis.htm
France, sur écorce de Rhamnus alpina Canyon du crêt de la Neige, alt. 1680 m - Thoiry - Ain
26/8/2017
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_5/Lecanora_circumborealis.htm
France, sur écorce de Rhamnus alpina Canyon du crêt de la Neige, alt. 1680 m - Thoiry - Ain
26/8/2017
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_5/Lecanora_circumborealis.htm
France, sur écorce de Rhamnus alpina Canyon du crêt de la Neige, alt. 1680 m - Thoiry - Ain
26/8/2017
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_5/Lecanora_circumborealis.htm
France, sur écorce de Rhamnus alpina Canyon du crêt de la Neige, alt. 1680 m - Thoiry - Ain
26/8/2017
Growth form: Crustose
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Commonnes-rarity: (info)
Alpine belt: absent
Subalpine belt: common
Montane belt: rather common
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
P.L. Nimis CC BY-SA 4.0
TSB 38804
Pier Luigi Nimis CC BY-SA 4.0
TSB 38804
Pier Luigi Nimis CC BY-SA 4.0
TSB 38806
P.L. Nimis CC BY-SA 4.0
TSB 38804
Pier Luigi Nimis - CC BY-SA 4.0
TSB 43932
Leif Stridvall - Source: http://www.stridvall.se/la/galleries.php . Courtesy: A. Stridvall
P.L. Nimis CC BY-SA 04
TSB 13736
Walter Obermayer CC BY-SA 4.0 - Source: Lichens of Noricum - http://lichens-of-noricum.uni-graz.at/
Walter Obermayer CC BY-SA 4.0 - Source: Lichens of Noricum - http://lichens-of-noricum.uni-graz.at/
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_5/Lecanora_circumborealis.htm
France, sur écorce de Rhamnus alpina Canyon du crêt de la Neige, alt. 1680 m - Thoiry - Ain
26/8/2017
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_5/Lecanora_circumborealis.htm
France, sur écorce de Rhamnus alpina Canyon du crêt de la Neige, alt. 1680 m - Thoiry - Ain
26/8/2017
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_5/Lecanora_circumborealis.htm
France, sur écorce de Rhamnus alpina Canyon du crêt de la Neige, alt. 1680 m - Thoiry - Ain
26/8/2017
