Distribution: N - Ven (Onofri & al. 2013), TAA (Nascimbene 2013, Onofri & al. 2013), Lomb (Gaggianese & al. 1999, Onofri & al. 2013), Emil (Onofri & al. 2013, Fariselli & al. 2020). C - Tosc (Monti & al. 1999, Onofri & al. 2013), Sar (Onofri & al. 2013). S - Camp (Violante & al. 2002, Onofri & al. 2013).
Description: Thallus crustose, episubstratic, forming a soft, gelatinous (when wet), green to dark green film made of spherical granules consisting of clumps of algal cells incompletely surrounded by 2-3 µm thick, appressed pseudoparenchymatous hyphae. Clamp connections absent in all hyphae. Basidiocarps not lichenized, with an umbilicate, 0.5-1.3 cm wide, dark brown to grey brown (darker in the central depression), omphaloid, marginally striate cap, much paler, at first white to grey-white, finally often brownish, shortly decurrent lamellae, and a 1.5-3 cm high, 1-3 mm thick stipe which is more or less concolourous with cap, and often pubescent at base. Basidia clavate, mostly with 2 sterigmata. Basidiospores 1-celled, hyaline, ellipsoid, (6-)7-10 x (3-)4-5(-6) µm, thin-walled. Photobiont chlorococcoid. Spot tests: all negative. Chemistry: thallus without lichen substances.
Note: on acid soil, often in clearings of Pinus-stands; known only from Europe (Swiss, Austrian and Italian Alps) and North America.
Growth form: Squamulose
Substrata: soil, terricolous mosses, and plant debris