Chrysothrix flavovirens Tønsberg

Graphis Scripta, 6: 31, 1994.
Synonyms:
Distribution: C - Sar (Tretiach 1997, Zedda & Sipman 2001).
Description: Thallus crustose-subleprose, episubstratic, thin and continuous to more rarely thick and cracked, dull pale yellow to pale greenish yellow (whitish yellow with age in herbarium), forming extensive patches of 15-25(-30) μm wide, loose (not linked by hyphae), soredia-like granules, sometimes delimited by an inconspicuous, pale prothallus. Apothecia rare, biatorine, usually few and scattered, <0.3 mm across, with a usually flat, rounded, yellow or orange, densely lemon-yellow pruinose disc and a hardly visible (often masked by the soredia), soon excluded proper margin. Proper exciple poorly developed; epithecium and hymenium interspersed with granules dissolving in K and later recrystallizing; hymenium colourless, 20-38(-45) µm high, I+ blue; pseudoparaphyses branched and anastomosing, intricately interwoven in a gelatinous matrix, the apical cells not swollen; hypothecium colourless, of densely interwoven hyphae. Asci 8-spored, clavate, with a K/I+ blue layer between the two walls which is thicker in the apical part, becoming more diffuse downwardly. Ascospores (0-)1-3-septate, hyaline, ellipsoid to shortly elongate, (8-)10-13(-15) x 2.7-3.5 µm. Photobiont chlorococcoid, the cells sparse and scattered, densely surrounded by hyphae. Spot tests: K-, C-, KC-, P-, UV+ dull to bright orange.
Note: a widespread species, also known from Asia and North America, with an apparently mainly subatlantic distribution in Europe, from Norway and Estonia to Spain, growing on rather dry, nutrient-poor bark of mature broad-leaved and coniferous trees, sometimes also on wood. Probably overlooked, being often sterile, but certainly rare in Italy, and restricted to warm-humid areas. Both Italian specimens, from Sardinia, were collected on Juniperus. It is included in the Italian red list of epiphytic lichens as “Endangered” (Nascimbene & al. 2013c).
Growth form: Leprose
Substrata: bark and lignum
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)
Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)

Commonnes-rarity: (info)

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

pH of the substrata:

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Solar irradiation:

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Aridity:

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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

Source: https://fungi.myspecies.info/sites/fungi.myspecies.info/files/A00631.jpg - CC BY NC
UK



P.L. Nimis CC BY-SA 04
TSB 25282



P.L. Nimis CC BY-SA 4.0
TSB 25282


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=362&lang=en
France, Morgat


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=362&lang=en
France, Morgat


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=362&lang=en
France, Morgat


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=362&lang=en
France, Pointe du Guern


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=362&lang=en
France, Pointe du Guern


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=362&lang=en
France, Telgruc-sur-mer


https://nhm2.uio.no/typephotos/lichens/arkiv/O-L-000764d.jpg
NORWAY, ØSTFOLD, HVALER: Kirkøya, between Storesand and Skjærhalden, 1990.07.03, Tønsberg, T. 13195 [59°01'N, 11°02'E] - ISOTYPE