Evernia mesomorpha Nyl.
Lichenes Scand.: 74, 1861.
Synonyms: Evernia prunastri var. thamnodes Flot.; Evernia thamnodes (Flot.) Arnold; Letharia mesomorpha (Nyl.) Du Rietz
Description: Thallus fruticose, attached by a basal holdfast, shrubby to subpendulous, up to 8(-10) cm long, irregularly branched, grooved and weakly ridged between grooves, pale greyish green to yellowish green on all sides. Branches with diffuse, granular to subcylindrical, finally sorediate isidia originating from cracks along the ridges. Cortex thin, of anticlinally arranged, small-celled hyphae; medulla white, rather dense, without strands. Apothecia rare, lecanorine, to 6 mm across, with a brown disc and a wrinkled thalline margin. Proper exciple colourless; epithecium brownish, hymenium colourless; paraphyses mostly simple, thick, septate, hypothecium colourless. Asci 8-spored, clavate, the K/I+ blue tholus penetrated by a faintly amyloid apical cushion with parallel or diverging flanks, the wall K/I-, surrounded by a K/I+ blue outer layer, Lecanora-type. Ascospores 1-celled, hyaline, ellipsoid, 8-9 x 5-6 µm. Pycnidia terminal on short lateral branches. Photobiont chlorococcoid. Spot tests: cortex K-, C-, KC+ yellowish, P-; medulla K-, C-, KC-, P-. Chemistry: cortex with usnic acid; medulla with divaricatic acid.
Growth form: Fruticose
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: rather rare
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
Siri Synnøve Høie; Owner: Siri Synnøve Høie, Natural History Museum, University of Oslo, Norway – CC BY-SA NC
P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (12983)
2001/12/12
main branch with sorediose isidia
Triin Aimla; Owner: University of Tartu
Gabriele Gheza, Tromello (PV); Owner: Gabriele Gheza, Tromello (PV)
Curtis Randall Björk – CC BY-SA 4.0
Corageous Lake, Northwest Territories, Canada
08.2011
P.L. Nimis CC BY-SA 4.0
TSB 12983
E. Pittao CC BY-SA 4.0
TSB 31449
Siri Synnøve Høie; Natural History Museum, University of Oslo, Norway – CC BY-SA NC
E. Pittao CC BY-SA 4.0
TSB 31449
Growth form: Fruticose
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: rather rare
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
Siri Synnøve Høie; Owner: Siri Synnøve Høie, Natural History Museum, University of Oslo, Norway – CC BY-SA NC
P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (12983)
2001/12/12
main branch with sorediose isidia
Triin Aimla; Owner: University of Tartu
Gabriele Gheza, Tromello (PV); Owner: Gabriele Gheza, Tromello (PV)
Curtis Randall Björk – CC BY-SA 4.0
Corageous Lake, Northwest Territories, Canada
08.2011
P.L. Nimis CC BY-SA 4.0
TSB 12983
E. Pittao CC BY-SA 4.0
TSB 31449
Siri Synnøve Høie; Natural History Museum, University of Oslo, Norway – CC BY-SA NC
