Lecidea tessellata var. caesia (Anzi) Arnold

Arnold, Verh. zool.-bot. Ges. Wien, 39: 264, 1889. Basionym: Lecidea spilota var. caesia Anzi - Cat. Lich. Sondr.: 80, 1860.
Synonyms: Biatora casimirii Müll. Arg.; Lecidea azurea Kremp.; Lecidea casimirii (Müll. Arg.) Müll. Arg.; Lecidea injuncta Nyl.; Lecidella azurea (Kremp.) Körb.
Distribution: N - Frl (Tretiach & Hafellner 2000), TAA (Hertel & Schuhwerk 2010), Lomb (Anzi Lich. Lang. 125: Hertel 1995), Piem (Isocrono & al. 2004), Emil (Fariselli & al. 2020), Lig (TSB 33416).
Description: Thallus crustose, episubstratic, 1.5-3(-5) mm thick in central parts, forming small patches, sometimes delimited by a grey prothallus, finely rimose-areolate, the areoles contiguous, flat to slightly convex, greyish white to pale bluish grey. Cortex 10-17 µm thick; medulla thick, white, I+ deep blue. Apothecia lecideine, black, mostly developed between the areoles, usually clustered, 0.3-1.8 mm across, with a black, flat to slightly convex, epruinose or weakly pruinose disc, and a thin, often soon excluded proper margin. Proper exciple poorly developed, with a brownish rim, colourless within; epithecium olive-brown, grey or green-black, 10-15 µm high; hymenium colourless or pale green, 40-75 µm high, I+ blue; paraphyses simple or rarely branched, usually not anastomosing, 1.8-2.7 µm thick at mid-level, the apical cell 3.5-6 µm wide; hypothecium colourless to very pale green or yellowish brown. Asci 8-spored, clavate, Lecidea-type. Ascospores 1-celled, hyaline, ellipsoid to broadly ellipsoid, 8-11 x 4.5-6 µm, not halonate, rather thick-walled. Pycnidia semi-immersed, black, the ostiolar region often elongate and almost lirelliform. Conidia bacilliform, 7-19 x 1-1.5 µm. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-. Chemistry: confluentic acid (major).
Note: on calciferous siliceous rocks, dolomite, superficially decalcified, hard limestone rocks near and above treeline, starting the life-cycle on other crustose lichens, especially Aspicilia spp.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
paras crustose lichens

Commonnes-rarity: (info)

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

pH of the substrata:


Solar irradiation:








Altitudinal distribution:


Predictive model
Herbarium samples

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (33416)