Candelaria pacifica M. Westb. & Arup

Bibl. Lichenol., 106: 358, 2011.
Synonyms:
Distribution: N - Frl (TSB s.n.), Ven (TSB s.n.).
Description: Thallus minutely foliose to subsquamulose, bright lemon yellow, paling to yellow-green in shade, forming rosettes to 5 mm wide, often coalescing into colonies up to 30 cm across. Lobes narrow and short, subsquamulose, 0.1-0.6 mm wide, adnate or ascending, dorsiventral, sparse to imbricate, with granular blastidia ((35-40 μm wide), most common on the more or less fan-shaped ends. Upper cortex c. 10-45 µm thick; medulla white, very thin; lower cortex absent. Lower surface with an arachnoid appearance, white and transparent, showing the green algal layer. Apothecia extremely rare in Europe (not observed in Italian material), sessile, to c. 1 mm diam., with a yellow, plane to finally convex disc, and a smooth but often sorediate margin. Epithecium yellow-brown, granular; hymenium colourless; paraphyses simple, cylindrical to submoniliform; hypothecium colourless. Asci 8-spored, clavate, Candelaria-type. Ascospores simple, guttulate, hyaline, oblong-ellipsoid, 11-16 x 4-6 µm. Pycnidia appearing as raised warts on the thallus surface. Conidia ellipsoid, 2.5-3.5 x c. 1.5 µm. Photobiont chlorococcoid. Spot tests: all negative. Chemistry: probably calycin (major) and pulvinic dilactone (minor).
Note: a recently-described species, which in some parts of Europe, e.g. in Scandinavia, is even more common than C. concolor. Italian material of C. concolor needs revision: from a rapid screening of the TSB material it seems that in Italy this species is rarer than C. concolor.
Growth form: Foliose, narrow lobed
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: absent
Oromediterranean belt: absent
Montane belt: very rare
Submediterranean belt: rare
Padanian area: very rare
Humid submediterranean belt: extremely rare
Humid mediterranean belt: absent
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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John Skinner
on Acer platanoides on roadside verge; UK, Essex, Southend-on-Sea.
31.07.2017


John Skinner
on Acer platanoides on roadside verge; UK, Essex, Southend-on-Sea.
31.07.2017


John Skinner
on Acer platanoides on roadside verge; UK, Essex, Southend-on-Sea.
31.07.2017



P.L. Nimis CC BY-SA 04
TSB 44166