Lecidea leucothallina Arnold var. discrepans Rambold & Hertel

in Hertel, Bibl. Lichenol., 58: 163, 1995
Description: Thallus crustose, episubstratic, 0.2-0.5(-1) mm thick, areolate to squamulose-areolate, the areoles mostly rounded, scattered on a black hypothallus, grey-brown to pale brown. Cortex with an epinecral layer; medulla white, I- Apothecia lecideine, black, sessile, with a slightly concave to slightly convex, smooth, matt, epruinose disc and a persistent to finally excluded proper margin. Proper exciple violet-brown, darker in outer part, usually blue-green in a thin line within, c. 80 µm wide laterally, of parallel-radiating hyphae, the outer cells 2.5-4 µm wide, thin-walled; epithecium brown or olive-brown P-; hymenium colourless, (45-)50-60 µm high; paraphyses strongly coherent; hypothecium brown to reddish-brown. Asci 8-spored, narrowly clavate, thick-walled, with a K/I+ pale blue tholus and a strongly amyloid, thin apical cushion, surrounded by a I+ blue outer layer, Lecidea-type. Ascospores 1-celled, hyaline, oblong-ellipsoid, 6.6-10.4 x 4-5 µm, 1.5-2.4 times as long as wide. Pycnidia black, immersed. Conidia bacilliform, 11-20 µm long. Photobiont chlorococcoid. Spot tests: medulla K+ yellow, C-, KC-, P+ orange. Chemistry: medulla with stictic acid (major) and norstictic acid (traces)-
Note: on hard siliceous rocks, often in sites with a long snow cover in the alpine belt; reported from the Eastern Alps (Austria); to be looked for in the Italian Alps.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

pH of the substrata:


Solar irradiation:








Altitudinal distribution:


Predictive model


Muller,J (1894) Lichens, in: Th. Durand & H. Pittier, Primitiae Florae Costaricensis. Bulletin de la Societe royale de Botanique de Belgique\Bull. Soc. Roy. Bot. Belg.

Steiner,J (1921) Lichenes aus Mesopotamien und Kurdistan sowie Syrien und Prinkipo, gesammelt von Dr. Heinrich Frh. v. Handel-Mazetti (Wissenschafl. Ergebnisse der Exped. nach Mesopotamien 1910). Ann. Naturhist. Staatsmus.

Inoue, M (1982) The genera Lecidea, Lecidella and Huilia in Japan I. Lecidea. Journal of Science of the Hiroshima University, Series B, Division 2 (Botany) https://nhm2.uio.no/botanisk/lav/RLL/PDF/R9124.pdf

Hertel, H (1995) Schlussel fur die Arten der Flechtenfamilie Lecideaceae in Europa. Scripta Lichenologica - Lichenological Papers Dedicated to Antonin Vezda

Hertel, H (2001) Floristic and taxonomic notes on saxicolous lecideoid lichens. Sendtnera

Haugan, R./ Timdal, E. (2018) Lecidea toensbergii, the first described sorediate species in Lecidea sensu stricto. Graphis Scripta