Collema glebulentum (Cromb.) Degel.

H. Magn. ex Degel., Symb. Bot. Upsal., 13, 2: 406, 1954. Basionym: Leptogium glebulentum Nyl. ex Cromb. - J. Bot., 20: 272, 1882.
Synonyms: Collema coralliferum Degel.; Collema furvellum Räsänen
Distribution: N - TAA (Nascimbene & al. 2021).
Description: Thallus foliose, homoiomerous, gelatinous when wet, more or less deeply lobed, membranous, closely adpressed, 3-6 cm wide. Lobes 5-8 mm wide, 0.1-0.2 mm thick, dark olive-green to black, the surface conspicuously folded, with ascending, entire or isidiate, never swollen margins. Isidia abundant, c. 0.1 mm thick, to 1.5 mm long, globose when young, then cylindrical and coralloid, usually crowded and forming a dense, coarsely areolate crust on older parts of thallus. Upper and lower cortices absent. Apothecia and pycnidia unknown. Photobiont cyanobacterial (Nostoc, the cells arranged in long chains). Spot tests: all negative. Chemistry: without lichen substances.
Note: an arctic-alpine species found on basic siliceous rocks, more rarely on limestone, in humid situations near or above treeline; another record is in Swiss territory, near the Italian border with Lombardy.
Growth form: Foliose, narrow lobed
Substrata: rocks
Photobiont: cyanobacteria, filamentous (e.g. Nostoc, Scytonema)
Reproductive strategy: mainly asexual, by isidia, or isidia-like structures (e.g. schizidia)

Commonnes-rarity: (info)

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

pH of the substrata:


Solar irradiation:








Altitudinal distribution:


Predictive model
Herbarium samples

Einar Timdal - Source: - CC BY-NC

Curtis Randall Björk, - CC BY-SA 4.0
Boundary Ranges, British Columbia, Canada