Miriquidica plumbea (Garov. ex A. Massal.) Hafellner, Obermayer & Tretiach

Lichenologist, 46: 17, 2014. Basionym: Lecidea plumbea Garov. ex A. Massal. - Ric. Auton. Lich. Crost.: 74: 1852.
Synonyms: Miriquidica limitata Hertel & Rambold
Distribution: N - Frl (Tretiach & Hafellner 2000, Hafellner & al. 2014), TAA (Nascimbene & al. 2022), Lomb (Hafellner & al. 2014), Piem (Hafellner & al. 2014).
Description: Thallus crustose, episubstratic, grey, areolate, up to 5 cm diam, the areoles flat to subconvex, 0.4-1 mm diam., developing on an often poorly evident black hypothallus. Medulla white, I-. Apothecia 0.6-1.2 mm across, aspicilioid when young, later lecideoid and semi-immersed at edges of areoles, mostly polygonal in outline, with a black disc and a thin margin, Proper exciple externally dark olive-brown at least in upper part, hyaline to brownish in inner part, inspersed with granules; epithecium olive-brown; hymenium colourless, 50-70 µm high, I+ blue; paraphyses mostly simple, 1.5.-2 µm thick at mid-level, the apical cells slightly enlarged, up to 4 mm wide, embedded in a pigmented gel; hypothecium colourless. Asci 8-spored, clavate, approaching the Lecanora-type, but with a well-developed, weakly amyloid tholus and a relatively narrow, non-amyloid axial mass. Ascospores 1-celled, hyaline, ellipsoid, 9-13 x 4-5 µm. Pycnidia black, immersed. Conidia thread-like, curved, 18-25 x c. 1 µm. Photobiont chlorococcoid. Spot tests: cortex K-, C-, KC-, P-; medulla K-, C-, KC-, P+ orange-red. Chemistry: protocetraric acid and miriquidic acids.
Note: an alpine to subnival species, confined to steep or overhanging surfaces of hard siliceous rocks, often with a high iron content.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Species of metal-rich rocks

Commonnes-rarity: (info)

Alpine belt: very rare
Subalpine belt: extremely 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; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (26470)

P.L. Nimis CC BY-SA 4.0
TSB 26470

Pier Luigi Nimis - CC BY-SA 4.0
TSB 44409