Fungal Divers. (online version), 64: 286, 2013. Basionym: Collema coccophorum Tuck. - Proc. Amer. Acad. Arts and Sc., 5: 385, 1862.
Synonyms: Collema harmandii Samp.; Collema pulposum var. microphyllum Harm.
Distribution: N - Emil (Nascimbene & al. 2021). C- Tosc (Loppi & al. 1998).
Description: Thallus foliose, homoiomerous, gelatinous when wet, black, thick, up to 3 cm diam. Lobes elongate, radiating or sometimes imbricate, more or less smooth, 0.5-3 mm broad, plane to concave, more or less swollen, resembling those of typical E. tenax. Upper and lower cortex absent. Apothecia frequent, lecanorine, sessile, up to 4 mm diam. Disc reddish brown to brown, flat to convex; margin thick, smooth to lobulate. Exciple euthyplectenchymatous; epithecium brownish; hymenium colourless, I+ blue, 70-90(-100 ) µm tall; paraphyses simple or sparingly branched, with clavate to subglobose tips; hypothecium colourless. Asci 8-spored, clavate, the apex thick, with a I+ blue apical dome and a I+ blue annulus projecting downwardly. Ascospores 1-septate, hyaline, ellipsoid to fusiform, (13-)15-24(-28) x 6.5-8.5 µm. Conidia slightly swollen toward ends, 4.5-6 x 1.5-18 µm. Photobiont cyanobacterial (Nostoc, in long chains). Spot tests: all negative. Chemistry: without lichen substances.
Note: on calciferous soil in dry grasslands: this almost cosmopolitan species of dry areas - which can be easily mistaken for E. tenax - might be more widespread in Italy, especially in dry Mediterranean areas of the South.
Growth form: Foliose, narrow lobed
Substrata: soil, terricolous mosses, and plant debris