Lecidella elaeochroma (Ach.) M. Choisy var. flavicans (Ach.) Hazsl.
Magyar Birodalom Zuzmó-Flórájá: 197, 1884. Basionym: Lecidea anomala var. flavicans Ach. - syn. Meth. Lich.: 39, 1814.
Synonyms: Lecidea flavens (Nyl.) Nyl.; Lecidea parasema var. flavens Nyl.
Distribution: N - TAA. C - Tosc (Putortì & al. 1998), Laz. S - Camp (Garofalo & al. 2010), Pugl (Nimis & Tretiach 1999), Cal (Puntillo 1996), Si (Nimis & al. 1996b).
Description: Thallus crustose, episubstratic, continuous to verrucose, usually up to 0.7 mm thick, sulphur yellow to greenish yellow, often delimited by a dark prothallus. Apothecia common, lecideine, black (brown in old or damaged specimens), sessile, (0.5-)1-1.5 mm across, with a flat to finally convex disc and a smooth to flexuose, often shiny, finally excluded proper margin. Proper exciple blue-green in outer part, colourless inside, sometimes with crystals dissolving in K; epithecium blackish green, bluish green to dull grey-blue, rarely olive; hymenium colourless, not inspersed with oil droplets, 40-70 µm high; paraphyses easily made free in K, simple, rarely anastomosing or branched in upper part, not capitate; hypothecium brownish orange (K+ bright red-brown) to reddish brown. Asci 8-spored, clavate, with an intensely I+ blue tholus penetrated by a weakly amyloid, broadly cylindrical axial mass, and a poorly developed ocular chamber, Lecidella-type. Ascospores 1-celled, hyaline, thick-walled, broadly ellipsoid to ellipsoid, 9-19 x 4.5-10 µm. Pycnidia dark, immersed. Conidia thread-like, more or less curved. Photobiont chlorococcoid. Spot tests: thallus K+ yellow, KC+ yellow-orange, C+ orange, P- or P+ pale yellow. Chemistry: artothelin, granulosin, different xanthones.
Note: morphs with a yellowish thallus (v. flavicans) are more frequent in the southern part of Tyrrhenian Italy, within eu-Mediterranean vegetation. They were not always distinguished from var. elaeochroma in the literature