Lecidea speirodes Nyl.

Flora, 68: 44, 1885.
Synonyms: Lecidea contigua var. subcretacea Arnold; Lecidea decorosa Arnold; Lecidea subcretacea (Arnold) P. Syd.; Lecidea subumbonata sensu Arnold et Lettau non Nyl.
Distribution: N - TAA (Hertel & Schuhwerk 2010), Piem (TSB 33167), VA (Piervittori & Isocrono 1999), Lig. C - Abr (Nimis & Tretiach 1999, Gheza & al. 2021).
Description: Thallus crustose, episubstratic, continuous or rimose, chalky white, often with a bluish tinge, 0.2-1.2 mm thick, most often without a clear prothallus, rarely with a thin dark prothallus. Medulla white, I+ deep blue. Apothecia lecideine, black, epruinose, (0.2-)0.4-2(-3) mm across, with a flat to finally strongly convex disc and a persistent, raised, wavy proper margin. Proper exciple green-black to brown-black along the thin outer rim, colourless or pale grey within, C+ orange-red; epithecium green-black, K-, hymenium bright blue green, rarely brownish or colourless, 50-70 µm high; paraphyses coherent, simple or forked in upper part, c. 2 µm thick at mid-level, the apical cells hardly swollen, to 2.6 µm wide; hypothecium dark brown, K-. Asci 8-spored, clavate, Lecidea-type. Ascospores 1-celled, hyaline, ellipsoid, 6-12 x 3.5-6.5 µm, not halonate, thin-walled and pseudodiblastic. Pycnidia black, globose, immersed. Conidia bacilliform, 5-15 x 0.8-1.5 µm. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-. Chemistry: thallus without lichen substances.
Note: a lichen known from the central and southern European mountains (Alps, Pyrenees, Cordillera Cantabrica in Spain, Tatra Mountains), found on steeply inclined, superficially decalcified calciferous rocks or on lime-containing siliceous rocks, with optimum in upland areas, up to the nival belt in the Alps. The world distribution was mapped by Hertel (2006). The record from Abruzzo (Gran Sasso) is the southernmost in Europe.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: rather rare
Subalpine belt: rare
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 CC BY-SA 4.0
TSB 30296

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (30296)
young apothecium

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (30296)