Polyozosia agardhiana subsp. catalaunica (Cl. Roux) ined.

. Basionym: Lecanora agardhiana subsp. catalaunica Cl. Roux - Bull. Soc. linn. Provence, 54: 120, 2003.
Distribution: C - Sar.
Description: Thallus crustose, endosubstratic, not apparent. Apothecia lecanorine, immersed in pits in the rock at least when young, later subsessile, 0.2-0.6 mm across, with a flat, dark brown to black, pruinose disc, and a thin, smooth, entire thalline margin. Thalline exciple corticate, usually more or less obscured by crystals which are insoluble in K, but soluble in N; epithecium greenish brown to patchily green and brownish, not granular, K-, N+ purple; hymenium colourless, 35-45 μm high; paraphyses slender, simple, free in K; hypothecium colourless, without granules. Asci 8-spored, elongate-clavate, very thin-walled, with a K/I+ blue, tall tholus penetrated by a faintly amyloid apical cushion, the wall K/I-, surrounded by a K/I+ blue outer layer, Lecanora-type. Ascospores 1-celled, hyaline, ellipsoid, 9-11 x 5.5-6.5 μm. Photobiont chlorococcoid. Spot tests: thallus (apothecial margin) K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a taxon worthy of further study, found on inclined surfaces of hard, compact calciferous rocks, mostly at low elevations.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Poorly known taxon in need of further study
Taxon bound to maritime-coastal situations

Commonnes-rarity: (info)

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

pH of the substrata:


Solar irradiation:








Altitudinal distribution:


Predictive model

P.L. Nimis CC BY-SA 04
TSB 24502

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (24502)
ssp. sapaudica with a epilithic thallus and prominent apothecia