Lathagrium undulatum (Flot.) Poetsch
in Poetsch & Schiedermayer, System. Aufzähl. samenlos. Pflanzen (Krypt.): 189, 1872. Basionym: Collema undulatum Laurer ex Flot. - Linnaea, 23: 161, 1850.
Synonyms: Collema aggregatum var. laureri (Flot.) Boistel; Collema laureri Flot.; Collema undulatum var. granulosum Degel.; Lathagrium laureri (Flot.) Arnold; Lathagrium laureri var. microphyllinum Bagl. & Carestia
Description: Thallus foliose, homoiomerous, gelatinous and 140-300 µm thick when wet, olive-black to black, forming irregular, deeply lobed, 3-6 cm (rarely more) wide rosettes. Lobes (2-)3-4(-5) mm broad, concave, smooth, ascending, with a coarsely undulate, not swollen margin, sometimes with mainly marginal, granulose, 0.1-0.2 mm wide isidia-like outgrowths; lower surface paler, with scattered to confluent tufts of white hapters. Upper and lower cortices absent. Apothecia common (rarer in pseudoisidiate specimens), lecanorine, sessile, (0.7-)1-1.5 mm across, with a flat to convex, red-brown to rarely black-brown disc and a thin, entire to crenulate thalline margin. Thalline exciple ecorticate or pseudocorticate in basal parts; proper exciple euparaplectenchymatous, up to 130 µm wide laterally; epithecium brownish; hymenium colourless, 85-105 µm high, I+ blue; paraphyses simple or sparingly branched in upper part, 2-3(-4) µm thick at mid-level, the apical cells clavate, 4.5-6.5 µm wide; hypothecium pale yellow to yellowish brown, I+ blue. Asci 8-spored, cylindrical-clavate, the apex strongly thickened, the apical dome K/I+ pale blue, with a downwardly projecting K/I+ deep blue tubular structure. Ascospores 3-septate, not or only slightly constricted at septa, hyaline, linear-oblong with rounded ends, 17-30 x 6.5-9 µm. Pycnidia common, mostly marginal, paler than thallus. Conidia bacilliform, slightly swollen at both ends, 4-5 x 1.1.5 µm. Photobiont cyanobacterial (Nostoc, the cells in long chains). Spot tests: all negative. Chemistry: without lichen substances.
Growth form: Foliose, broad lobed
Substrata: rocks
Photobiont: cyanobacteria, filamentous (e.g. Nostoc, Scytonema)
Reproductive strategy: mainly sexual
On otherwise dry surfaces with short periods of water seepage after rain
Commonnes-rarity: (info)
Alpine belt: extremely rare
Subalpine belt: very rare
Montane belt: rather rare
Dry submediterranean belt: very rare
Humid submediterranean belt: very rare
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
Curtis Randall Björk, - CC BY-SA 4.0
Sugarbowl-Grizzly Den Provincial Park, British Columbia, Canada
August 2017
as v. tilesii
P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (31661)
2001/12/09
Manilio Prignano; Owner: Manilio Prignano
Italia, Lazio, Monti Lepini
2010
Manilio Prignano; Owner: Manilio Prignano
Italia, Lazio, Monti Lepini
2010
Manilio Prignano; Owner: Manilio Prignano
Italia, Lazio, Monti Lepini
2010
Manilio Prignano; Owner: Manilio Prignano
Italia, Lazio, Monti Lepini
2010
P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (34782)
2001/02/02
Juri Nascimbene - CC BY-SA 4.0
Italy, Trentino-Alto Adige, Bolzano/Bozen, Sciliar/Schlern
Juri Nascimbene - CC BY-SA 4.0
Italy, Trentino-Alto Adige, Bolzano/Bozen, Sciliar/Schlern
Juri Nascimbene - CC BY-SA 4.0
Italy, Trentino-Alto Adige, Bolzano/Bozen, Sciliar/Schlern
Juri Nascimbene - CC BY-SA 4.0
Italy, Trentino-Alto Adige, Bolzano/Bozen, Sciliar/Schlern
Juri Nascimbene - CC BY-SA 4.0
Italy, Trentino-Alto Adige, Bolzano/Bozen, Sciliar/Schlern
Juri Nascimbene - CC BY-SA 4.0
Italy, Trentino-Alto Adige, Bolzano/Bozen, Sciliar/Schlern
Juri Nascimbene - CC BY-SA 4.0
Italy, Trentino-Alto Adige, Bolzano/Bozen, Sciliar/Schlern
Degelius G. 1954. The lichen genus Collema in Europe: Morphology, Taxonomy, Ecology. Symbolae Bot. Upsal. 13, 2: 1-499.
Zahlbruckner A. 1926. Lichenes (Flechten). In: Engler A. (ed.): Die natürlichen Pflanzenfamilien. 2nd ed., vol 8, W. Engelmann, Leipzig, 270 pp.
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_2/Lathagrium_undulatum.htm
France, session AFL 2015 - Lot
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_2/Lathagrium_undulatum.htm
France, session AFL 2015 - Lot
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_2/Lathagrium_undulatum.htm
France, session AFL 2015 - Lot
var.granulosum
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_2/Lathagrium_undulatum.htm
France, session AFL 2015 - Lot
var.granulosum
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_2/Lathagrium_undulatum.htm
France, session AFL 2015 - Lot
var.granulosum
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_2/Lathagrium_undulatum.htm
France, session AFL 2015 - Lot
var.granulosum
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_2/Lathagrium_undulatum.htm
France, session AFL 2015 - Lot
var.granulosum
Growth form: Foliose, broad lobed
Substrata: rocks
Photobiont: cyanobacteria, filamentous (e.g. Nostoc, Scytonema)
Reproductive strategy: mainly sexual
On otherwise dry surfaces with short periods of water seepage after rain
Commonnes-rarity: (info)
Alpine belt: extremely rare
Subalpine belt: very rare
Montane belt: rather rare
Dry submediterranean belt: very rare
Humid submediterranean belt: very rare
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
Curtis Randall Björk, - CC BY-SA 4.0
Sugarbowl-Grizzly Den Provincial Park, British Columbia, Canada
August 2017
as v. tilesii
P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (31661)
2001/12/09
Manilio Prignano; Owner: Manilio Prignano
Italia, Lazio, Monti Lepini
2010
Manilio Prignano; Owner: Manilio Prignano
Italia, Lazio, Monti Lepini
2010
Manilio Prignano; Owner: Manilio Prignano
Italia, Lazio, Monti Lepini
2010
Manilio Prignano; Owner: Manilio Prignano
Italia, Lazio, Monti Lepini
2010
P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (34782)
2001/02/02
Juri Nascimbene - CC BY-SA 4.0
Italy, Trentino-Alto Adige, Bolzano/Bozen, Sciliar/Schlern
Juri Nascimbene - CC BY-SA 4.0
Italy, Trentino-Alto Adige, Bolzano/Bozen, Sciliar/Schlern
Juri Nascimbene - CC BY-SA 4.0
Italy, Trentino-Alto Adige, Bolzano/Bozen, Sciliar/Schlern
Juri Nascimbene - CC BY-SA 4.0
Italy, Trentino-Alto Adige, Bolzano/Bozen, Sciliar/Schlern
Juri Nascimbene - CC BY-SA 4.0
Italy, Trentino-Alto Adige, Bolzano/Bozen, Sciliar/Schlern
Juri Nascimbene - CC BY-SA 4.0
Italy, Trentino-Alto Adige, Bolzano/Bozen, Sciliar/Schlern
Juri Nascimbene - CC BY-SA 4.0
Italy, Trentino-Alto Adige, Bolzano/Bozen, Sciliar/Schlern
Degelius G. 1954. The lichen genus Collema in Europe: Morphology, Taxonomy, Ecology. Symbolae Bot. Upsal. 13, 2: 1-499.
Zahlbruckner A. 1926. Lichenes (Flechten). In: Engler A. (ed.): Die natürlichen Pflanzenfamilien. 2nd ed., vol 8, W. Engelmann, Leipzig, 270 pp.
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_2/Lathagrium_undulatum.htm
France, session AFL 2015 - Lot
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_2/Lathagrium_undulatum.htm
France, session AFL 2015 - Lot
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_2/Lathagrium_undulatum.htm
France, session AFL 2015 - Lot
var.granulosum
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_2/Lathagrium_undulatum.htm
France, session AFL 2015 - Lot
var.granulosum
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_2/Lathagrium_undulatum.htm
France, session AFL 2015 - Lot
var.granulosum
Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_2/Lathagrium_undulatum.htm
France, session AFL 2015 - Lot
var.granulosum
