Lecidella viridans (Flot.) Körb.

Syst. Lich. Germ.: 242, 1855. Basionym: Lecidea sabuletorum var. viridans Flot. - Flora, 11: 697-698, 1828.
Synonyms: Biatora viridans (Flot.) Hepp; Lecidea elaeochromiza (Nyl.) H. Olivier; Lecidea glomerulosa (DC.) Steud. f. elaeochromiza (Nyl.) Zahlbr.; Lecidea viridans (Flot.) Lamy; Lecidella elaeochromiza (Nyl.) M. Choisy
Distribution: N - Frl (TSB14171), Ven, TAA (Knoph & Leuckert 2000), Lomb, Piem (Isocrono & al. 2004), Lig (Watson 2014). C - Tosc, Sar. S - Camp, Si (Grillo 1998, Grillo & Caniglia 2004).
Description: Thallus crustose, episubstratic, granulose or minutely verrucose, 0.1-0.3 mm thick, yellowish white to greenish yellow, rarely delimited by a dark prothallus. Cortex up to 25 µm thick, patchily overlain by an epinecral layer, sometimes strongly filled with crystals; medulla white I-. Apothecia lecideine, black, sessile and constricted at base, 0.2-0.4(-0.5) mm across, with a flat to finally convex, epruinose disc, and a thin, often grey-green-pruinose, finally often excluded proper margin. Proper exciple thin (up to 75 µm thick laterally), brown to grey-green in outer part, colourless to very pale brown within, without crystals; epithecium grey-green, olive-green or brown, with granular crystals dissolving in K, 5-10 µm high; hymenium colourless, not inspersed with oil droplets, 50-65 µm high; paraphyses easily made free in K, simple, rarely branched and anastomosing, 1,5-2 µm thick at mid-level, the apical cells up to 4.5 µm wide; hypothecium colourless to very pale brown in old apothecia, not filled with crystals, K-. 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, ellipsoid, 9-13 x 5-7 µm, thick-walled. Photobiont chlorococcoid. Spot tests: K-, C+ orange, KC+ orange, P-. Chemistry: 4,5-dichloronorlichexanthone, arthothelin, isoarthothelin, and thiophanic acid, plus traces of thuringione.
Note: on base-rich or slightly calciferous siliceous rocks, especially on steeply inclined faces, in dry-warm areas.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Subcontinental: restricted to areas with a dry-subcontinental climate (e.g. dry Alpine valleys, parts of Mediterranean Italy)

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: extremely rare
Submediterranean belt: extremely rare
Padanian area: absent
Humid submediterranean belt: extremely rare
Humid mediterranean belt: absent
Dry mediterranean belt: extremely rare

pH of the substrata:


Solar irradiation:








Altitudinal distribution:


Predictive model
Herbarium samples

P.L. Nimis CC BY-SA 4.0
TSB 25669

P.L. Nimis CC BY-SA 4.0
TSB 25669

P.L. Nimis CC BY-SA 4.0
TSB 14171

P.L. Nimis CC BY-SA 4.0
TSB 14171


Murray, J (1963) Lichens from Cape Hallett Area, Antarctica. Trans. Roy. Soc. New Zealand, Bot.

Hertel, H/ Leuckert, C (1969) Uber Flechtenstoffe und Systematik einiger Arten der Gattung Lecidea, Placopsis und Trapelia mit C+ rot reagierendem Thallus. Willdenowia

Leuckert, C/ Knoph, J-G/ Ziegler, HG/ Hertel, H (1990) Chemotaxonomische Studien in der Gattung Lecidella (Lecanorales, Lecanoraceae) I. Herzogia https://www.schweizerbart.de/papers/herzogia/detail/8/101463/Chemotaxonomische_Studien_in_der_Gattung_Lecidella_Lecanorales_Lecanoraceae_I_Lecidella_carpathica_und_Lecidella_viridans_Untersuchungen_an_mittel_und_sudeuropaischen_Proben

Serusiaux, E/ Diederich, P/ Brand, AM/ van den Boom, P (1999) New or interesting lichens and lichenicolous fungi from Belgium and Luxembourg. VIII [Lichens et champignons nouveaux ou interessants pour la flore de la Belgique et du G.-D. de Luxembourg. VIII]. Lejeunia http://www.lichenology.info/pdf/L8LR.pdf

Urbanavichus, G.P./ Urbanavichene, I.N. (2017) Contribution to the lichen flora of Erzi Nature Reserve, Republic of Ingushetia, North Caucasus, Russia. Willdenowia