ITALIC 8.0

Polycauliona ucrainica (S.Y. Kondr.) Frödén, Arup & Søchting

in Arup & al., Nordic J. Bot., 31, 1: 53, 2013. Basionym: Xanthoria ucrainica S.Y. Kondr. - Lichenologist, 29, 5: 435, 1997

Synonyms:

Distribution:

Description: Thallus foliose to subsquamulose, greenish yellow to lemon-yellow, sometimes grey in older parts, consisting of small 0.7-1.2(-1.7) mm long and 0.7-1.2 mm wide, basally constricted (0.2-0.3 mm wide), often slightly fan-shaped, dorsiventral, ascending, subumbilicate squamules/lobes forming up to 0.35 mm wide patches which often merge covering much larger areas. Margins of lobes undulate, with abundant, (35-)40-60(-65) µm wide, brownish orange blastidia which also occur on the erhizinate lower surface; conblastidia absent. Upper and lower cortex paraplectenchymatous; medulla white. Apothecia unknown. Pycnidia frequent, immersed in orange-red warts. Conidia broadly ellipsoid, (1.9-)2.2-2.5(-3.1) x 1.2-1.5(-1.8) µm. Photobiont chlorococcoid. Spot tests: thallus, apothecia and blastidia K+ dark red, C-, KC-, P-, UV+ orange. Chemistry: parietin (major), fallacinal, emodin, teloschistin and parietinic acid, corresponding chemosyndrome A of Søchting (1997).

Note: a species described from the Ukraine, very similar to and difficult to distinguish from P. candelaria, known from several European countries. To be looked for in Italy.

Growth form: Foliose

Substrata: bark

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)

pH of the substrata:

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5

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Solar irradiation:

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5

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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

Index Fungorum GBIF

Michel David - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=767&lang=en

France, Hanvec
as Xanthoria candelaria, identification (by P.L. Nimis) uncertain

Modified from: https://gzu.jacq.org/GZU000284907

GZU000284907 - Ident. history orig.: Xanthoria ucrainica Collector Kondratyuk,S. Y. s.n. Date 1994-04-26 Location Ukraine Label Ukraine, Chernihiv town, central park Habitat at the basis of trees, on the bark of Quercus robur Habitus Annotations Lichen Herbarium M. H. Kholodny Institute of Botany (KW)