Protologue type data: Ukraine, Khersonska oblast: Chaplinsky district, c. 4.5 km W of village Zaozerne, Kakhovskiy kanal water channel, alt. c. 30 m, 46°35'44.37"N, 033°53'13.21"E, on dry surface of concrete water channel, c. 1 m above water level, 7.6.2006, J. Vondrák & J. Soun (CBFS JV4636 - holotypus; Selected exsiccates of Caloplaca, fasc. 2: http://botanika.bf.jcu.cz/lichenology/index.php?pg=7-isotypi).

Type locality: Data lacking.

Coordinates: 46°35'44.37"N, 033°53'13.21"E.

Thallus: crustose, areolate, forming patches up to 1.5 cm diam., whitish-grey (by pruina) to grey, greenish when wet, (50-)170 ± 50(-270) µm high (n=28). Areoles angular to minutely squamiform, (0.26-)0.56 ± 0.21(-0.99) mm diam. (n=31), flat or with raised margins, sorediate; old areoles sometimes overgrown by young thalli. Soralia marginal, erupting from lower surface of areoles, dark-grey to green-grey, darker than surfaces of areoles (containing Sedifolia-grey), old areoles sometimes completely sorediate, often confluent and forming a dark gray sorediate crust. Soredia (17-)31 ± 7(-53) µm diam. (n=46). True cortex not developed or rarely present, thin, up to 10 µm, formed of 1-2 rows of paraplectenchymatous, thin-walled cells. Phenocortex usually present, c. 20-40 µm high. Epinecral layer c. 5-10 µm thick, crystalline pruina white, sometimes strongly developed, up to 25 µm thick. Algal layer formed of cells (6.0-)14.0 ± 4.5(-23.0) µm diam. (n=43), surrounded with thin-walled, isodiametric fungal cells, (2.0-)4.9 ± 1.6(-8.5) µm diam. (n=34), or elongated cells c. 3-5 µm thick. Medulla inconspicuous, ± prosoplectenchymatous, loose, formed by hyphal strands of rather elongated cells, c. 2.5-5 µm thick, growing among substratum particles.
Apothecia first urceolate, later flat, (0.26-)0.54 ± 0.18(-1.1) mm diam. (n=43), with brown to black disc (darker apothecia contain more Sedifolia-grey in epihymenium) and whitish margin. Apothecial margin zeorine, sometimes seemingly lecanorine, but both true and thalline exciples always present. True exciple (35-)64 ± 18(-100) µm thick (n=28), formed of thin-walled, elongated cells, (2.0-)4.0 ± 0.9(-5.0) µm wide (n=21), that may be almost isodiametric in uppermost part. Upper part of true exciple grey-brown (Sedifolia-grey). Thalline exciple (70-)103 ± 37(-210) µm thick (n=29), without cortex, sometimes crenelated when old. Hypothecium (40-)119 ± 48(-230) µm high in central part (n=23), hyaline, ± paraplectenchymatous, of cells (3.0-)6.25 ± 2.5(-12.0) µm diam. (n=16). Hymenium (70-)92 ± 10(-110) µm high (n=27), with epihymenium ± slightly greyish, usually covered by crystalline pruina. Paraphyses c. 1.5-3.5 µm wide, but terminal and subterminal cells usually inflated, (2.5-)4.0 ± 0.9(-5.5) µm thick (n=33). Asci of Teloschistes-type, clavate to cylindrical, 8-spored, (47-)59 ± 6(-71) x (13-)17 ± 3(-24) µm (n=31). Ascospores polarilocular, (13.0-)15.7 ± 2.0(-20.5) x (5.0-)7.1 ± 1.0(-9.0) µm in size (n=31); length/width ratio c. 2.2. Ascospore walls c. 0.2-0.5 µm wide; septa (2.0-)3.2 ± 0.5(-4.0) µm thick (n=31), c. 0.2 of spore length. Deformed ascospores with three loculi rarely observed. Pycnidia c. 80-100 µm diam. (n=4); wall around ostiolum slightly greyish (Sedifolia-grey). Conidiophores usually arranged in a tightly-packed tissue, variable in length, formed of 2-5 thin-walled ± isodiametric cells. Conidiogenous cells often obtude triangular, (3-)4.15 ± 0.6(-5) µm (n=20). Conidia broadly ellipsoid to subglobose, (1.5-)2.1 ± 0.4(-2.5) x (1.0-)1.5 ± 0.2(-2.0) µm (n=28). (Vondrák et al. 2008: 98-100).

Photobiont: Data lacking.

Chemistry: No acetone-soluble compounds were detected by HPLC in the thallus or apothecia. Sedifolia-grey, an acetone-insoluble pigment, war detected in the soralia, upper part of the exciple (strong reactions), epihymenium, and the walls of pycnidia (weak reactions). The upper surface of the thallus (incl. phenocortex) and surface of the thalline exciple do not contain Sedifolia grey pigment, except for rare patches with a true cortex (weak reactions). The chemical composition of the crystalline pruina is unknown, but some crystals in the epihymenium were observed in polarized light, and most of them dissolved after treatment with 5% acetic acid. (Vondrák et al. 2008: 98-100).

Ecology: On concrete.

Note:

Distribution Database: Distributions

Distribution Database: Discover Life

Picture Database: Tropical Lichens

Molecular Database: Genbank

Synonym Database: Index Fungorum

Synonym Database: Mycobank