ITALIC 7.0

Athallia skii (Khodos., Vondrák & Šoun) Arup, Frödén & Søchting

Nordic J. Bot., 31, 1: 37, 2013. Basionym: Caloplaca skii Khodos., Vondrák & Šoun - in Vondrák & al., Lichenologist, 44: 83, 2011 (2012)

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Distribution:

Description: Thallus crustose, endosubstratic or thinly episubstratic, continuous and film-like, often visible only around apothecia, whitish, light grey or more rarely pale yellow, without a distinct prothallus. Apothecia zeorine to biatorine, dispersed, (0.2-)0.3 (-0.5) mm across, at first immersed then sessile and sometimes weakly constricted at base; with a flat to weakly convex, yellow-orange, epruinose disc, a persistent, yellow (paler than disc) proper margin, and a greyish white to yellow-white thalline margin evident only in young apothecia but persistent on lower side of apothecia. Thalline exciple thin, with a loosely paraplectenchymatous alveolate cortex; proper exciple (25-)30-45(-50) μm wide, of radiating hyphae; epithecium yellow-orange, K+ red; hymenium colourless, (50-)60-75 μm high, inspersed with oil droplets; paraphyses simple or sparingly branched, 1.5-2 μm thick in lower part, the apical cells swollen, up to 4(-5.5) μm wide; hypothecium colourless Asci 8-spored, clavate, Teloschistes-type. Ascospores 2-celled, polarilocular, hyaline, narrowly ellipsoid, (7.5-)9-13 x (3-5)4-5-6-5 μm, often > 2 times as long as wide, the equatorial thickening (“septum”) 3.5-6.5 μm. Photobiont chlorococcoid. Spot tests. thallus K- or rarely (pigmented thalli) K+ red, C-, KC-, P-; apothecia K+ red, UV+ orange-red. Chemistry: parietin (major), sometimes traces of emodin, parietinic acid, fallacinal and teloschistin.

Note: A recently-described species growing on (often dead) twigs of coastal shrubs, often on Juniperus on sand dunes. Widespread in southern Europe and also known from Corsica; to be looked for in Italy.

Growth form: Crustose

Substrata: bark

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

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Altitudinal distribution:

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Predictive model