Nordic J. Bot. 31, 1: 45 (2013).

Basionym: Caloplaca dichroa Arup, Lichenologist 38, 1: 13 (2006).

Type: Sweden, Västergötland, Klefva infra Mösseberg. In saxis calcaris, 1914, Vrang. Malme: Lichenes suecici exsiccati 525 (LD - holotype, C, H, S - isotypes).

Thallus: areolate, of two colour forms, yellow and orange. Areoles (70-) 118 ± 36 (-210) µm thick (n = 19) and (0.24-) 0.6 ± 0.3 (-1.2) mm wide (n = 20), ± entirely covered by blastidia/soredia of limonia type, (23-) 40 ± 11 (-61) µm diam. (n = 30). Cortex indistinct, composed of 1-2 layers of cells; a thicker alveolate cortex developed in spots. Apothecia frequent, (0.42-) 0.49 ± 0.06 (-0.64) mm (n = 15). Disc in mature apothecia slightly concave to slightly convex. Exciple (50-) 83 ± 18 (-110) µm thick (n = 15), zeorine, the true exciple/thalline exciple ratio very variable; thalline exciple often covered by blastidia/soredia, enlarged with age. Hymenium c. 70-80 µm thick (n = 5). Paraphyses tips swollen up to (2.5-) 4.5 ± 1.0 (-6.0) µm (n = 34). Ascospores thick-walled (walls up to 2 µm) or thin-walled (walls less than 0.5 µm), (11.0-) 14.0 ± 1.5 (-16.0) x (6.0-) 7.25 ± 0.75 (-9.0) µm (n = 15); length / width ratio c. 1.93. Ascospore septa (3.5-) 4.0 ± 0.4 (-4.5) µm thick (n = 15), c. 0.29 of ascospore length. Conidia (1.5-) 2.5 ± 0.5 (-30) x (1.0-) 1.25 ± 0.25 (-1.5) µm (n = 20) (Vondrák et al. 2009: 594).

Photobiont: Data lacking.

Chemistry: "The thallus and apothecia in both the yellow and the orange forms contain parietin as a major compound, and small amounts of fallacinal, emodin, teloschistin and parietinic acid, which correspond to chemosyndrome A of Søchting (1997)" (Arup 2006: 13).

Ecology: Data lacking.

Molecular data: Genbank

Distribution: Database

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