Description: Thallus not evident, not lichenized, the hyphae immersed in the thallus of Solorina saccata, discolouring its thallus. Perithecia 0.2-0.6 mm across, immersed for c. 2/3 in the thallus of the host, dark brown. Paraphyses branched-anastomosing. Asci 8-spored, narrowly clavate. Ascospores mainly 3-5-septate, brown, 18-28 x 8-11 μm, slightly constricted at the level of the central septum. Photobiont absent. Spot tests: all negative. Chemistry: no lichen substances.
Note: an arctic-alpine lichenicolous fungus growing on the thalli of Solorina, more rarely of Peltigera, near or above treeline. The infection usually suppresses the development of ascomata in the host, so that the infested thalli are often sterile.
Growth form: Lichenicolous fungus
Substrata: soil, terricolous mosses, and plant debris