Endocarpon psorodeum (Nyl.) Blomb. & Forssell

Enum. Pl. Scand.: 97, 1880. Basionym: Verrucaria psorodea Nyl. - Notiser Sällsk. Fauna Fl. Fenn. Förh., 8: 188, 1866.
Synonyms: Dermatocarpon psorodeum (Nyl.) Vain.
Distribution: N - Lomb (Ravera & al. 2021), Piem (TSB 32667).
Description: Thallus squamulose, heteromerous, brown, grey-brown or green-brown, dark green when wet, forming dense pillows of imbricate squamules. Squamules 0.5-2.5 mm wide, concave to flat, crenulate-lobulate; lower surface pale brown to black, erhizinate. Upper cortex pseudoparenchymatous; lower cortex absent; medulla white, of loosely interwoven hyphae. Perithecia black, globose to broadly pyriform, without involucrellum, immersed in the squamules, 0.15-0.3 mm across. Hymenium colourless, I+ brown-red; paraphyses absent, substituted by 20-45 μm long periphyses; hymenial algae rounded, 2-3 μm wide. Asci 2-spored, clavate to cylindrical-clavate, bi- and fissitunicate, thin-walled, the wall non-amyloid. Ascospores muriform, at first colourless, then pale brown, ellipsoid, 27-51 x 12-24 μm. Photobiont chlorococcoid (Stichococcus, present in both thallus and hymenium). Spot tests: thallus and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: on mineral-rich basic siliceous rocks with some water seepage, usually in upland areas, often associated to colonies of cyanobacteria; probably more widespread in the Alps.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
On otherwise dry surfaces with short periods of water seepage after rain

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: very rare
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

Pier Luigi Nimis - CC BY-SA 4.0
Herbarium: TSB 32667

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (32667)