Usnea ceratina Ach.

Lichenogr. Univ.: 619, 1810.
Synonyms:
Description: Thallus fruticose-filamentous, rigid, greenish to greenish grey, shrubby when young, then pendulous, 20-30(-50) cm long, branching mainly isotomic-dichotomously with divergent to parallel branches. Main branches cylindrical or irregular, ochre-coloured or greenish grey at base, with numerous annular cracks, the segments cylindrical to more or less sausage-like, terete to subangular, usually without foveoles or transverse furrows; fibrils and papillae sparse to numerous, the fibrils perpendicular to the main branches, up to 1 cm long; lateral branches not constricted at attachment point, with wart-like tubercles which become white at the top and bear stipitate, ulcerose soralia and/or isidiomorphs. Soralia originating from the top of tubercles or occasionally on large fibrils, at first punctiform (<1/2 of branch diameter), finally sometimes completely covering the terminal branches; isidiomorphs rare to numerous, 0.1–0.2 mm long, clustered in the soralia. Cortex hard, vitreous in longitudinal section, 6-11% of total branch thickness; medulla dense to compact, 18-28%, pink (rarely white or yellowish); central axis pink to almost red, sometimes white or pale yellow, 26-48%; ratio axis/medulla ranging between 1.1 and 2.7. Apothecia usually absent. Photobiont chlorococcoid. Spot tests: cortex K-, C-, KC-, P-; medulla K-, C+ yellow, CK+ yellow-orange, P-. Chemistry: cortex with usnic acid; medulla with diffractaic acid (major), and variable amounts of barbatic and 4-O-demethylbarbatic acids, rarely with squamatic acid.
Growth form: Fruticose filamentous
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by thallus fragmentation

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: rather rare
Montane belt: rather common
Dry submediterranean belt: extremely rare
Humid submediterranean belt: very rare
Padanian area: 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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Rarity

absent
extremely rare
very rare
rare
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rather common
common
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Occurrence data
Predictive map
Model ImageCurrent prediction (1981-2010)
Model ImageFuture prediction (2071-2100) SSP 1-2.6
Model ImageFuture prediction (2071-2100) SSP 5-8.5
Predictive maps according to Francesconi et al. 2025

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: hhttps://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_U/Usnea_ceratina.htm
France, 25/5/2015 - session AFL dans le Lot - Saint-Soz


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=603&lang=en
France, Scaër


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=603&lang=en
France, Forêt du Cranou


Michel David - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=603&lang=en
France, Forêt du Cranou


Michel David - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=603&lang=en
France, Forêt du Cranou


Michel David - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=603&lang=en
France, Forêt du Cranou


Michel David - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=603&lang=en
France, Forêt du Cranou


Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=603&lang=en
France, Ardennes