Usnea glabrata (Ach.) Vain.

Ann. Acad. Sci. Fenn., Ser.A, 4, 7: 7: 1915. Basionym: Usnea plicata var. glabrata Ach. - Lichenogr. Univ.: 624, 1810.
Synonyms: Usnea barbata var. sorediifera Arnold; Usnea florida var. sorediifera (Arnold) Hue; Usnea kujalae Räsänen; Usnea sorediifera (Arnold) Lynge non auct.
Distribution: N - Ven (Caniglia & al. 1999, Nascimbene & Caniglia 2000b, 2003c), TAA (Nascimbene & Caniglia 2000b, 2002c, Nascimbene & al. 2006e, 2007b, 2022, Nimis & al. 2015), Lomb (Alessio & al. 1995), VA (Piervittori & Isocrono 1999, Matteucci & al. 2008, Isocrono & al. 2008). C - Tosc, Sar (Zedda 2002, 2002b). S - Cal (Puntillo 1996).
Description: Thallus fruticose-filamentous, greenish, tufted and shrubby, 1.5-5 cm long (rarely more), branching sympodially, mainly anisotomic-dichotomously with divergent branches. Main branches somewhat inflated, 0.4-1 mm thick, often foveolate and sometimes furrowed, not blackened at base. Lateral branches constricted at attachment point, often with annular cracks, the segments distinct, cylindrical to clearly sausage-like, terete to obtuse-angled, with thick apices. Papillae rare to absent; fibrils rare to usually abundant, spinulose, 1-2 mm long, irregularly spread along all branches. Soralia irregular, deeply concave to convex-globular and then efflorescent, occupying more than half the branch diameter (sometimes larger than the branch itself), originating from cortex, sometimes confluent, most abundant on terminal branches; isidiomorphs absent. Cortex shiny in longitudinal section, thin (4-8% of total branch thickness); medulla homogeneous, very loose, white, thick (24-38%); central axis white, thin (18-32%). Apothecia not observed in Italian material. Photobiont chlorococcoid. Spot tests: cortex K-, C-, KC-, P-; medulla K- or K+ brownish or very rarely K+ yellow then red, C-, KC-, P+ orange-red or very rarely P+ yellow. Chemistry: usnic acid in cortex; medulla with protocetraric, fumarprotocetraric, and variable amounts of convirensic acids, very rarely with salazinic and norstictic acids (major) and protocetraric and consalazinic acids (accessory); a third chemotype without medullary substances has been reported from Scandinavia.
Note: on bark, sometimes on lignum, in cold-humid, but open situations, mostly in the upper montane and subalpine belts. Most Italian records are from the Alps, but the species has been also reported from the Apennines, south to the mountains of Calabria.
Growth form: Fruticose filamentous
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)

Commonnes-rarity: (info)

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

pH of the substrata:

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Solar irradiation:

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model
Herbarium samples
Index Fungorum GBIF

Tiiu Tõrra; Owner: Tiiu Tõrra - Institute of Ecology and Earth Sciences, University of Tartu, Estonia


Tiiu Tõrra; Owner: Tiiu Tõrra - Institute of Ecology and Earth Sciences, University of Tartu, Estonia


Tiiu Tõrra; Owner: Tiiu Tõrra - Institute of Ecology and Earth Sciences, University of Tartu, Estonia


Tiiu Tõrra; Owner: Tiiu Tõrra - Institute of Ecology and Earth Sciences, University of Tartu, Estonia


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_U/Textes_U/Usnea_glabrata.htm
France, session AFL 2015 dans le Lot - Saint-Sozy


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_U/Textes_U/Usnea_glabrata.htm
France, session AFL 2015 dans le Lot - Saint-Sozy


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_U/Textes_U/Usnea_glabrata.htm
France, session AFL 2015 dans le Lot - Saint-Sozy


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_U/Textes_U/Usnea_glabrata.htm
France, session AFL 2015 dans le Lot - Saint-Sozy


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_U/Textes_U/Usnea_glabrata.htm
France, session AFL 2015 dans le Lot - Saint-Sozy


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_U/Textes_U/Usnea_glabrata.htm
France, session AFL 2015 dans le Lot - Saint-Sozy


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_U/Textes_U/Usnea_glabrata.htm
France, session AFL 2015 dans le Lot - Saint-Sozy