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Data Set Maintenance: Data set compiled. Data set author(s): Cáceres M. Data set not revised; not to be published after submission.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Stigmidium. Genus incertae sedis: Stigmidium; of unknown placement (incertae sedis).

Biogeography: Northern hemispheric, arctic. Continent: Europe and Northern America. Region(s): Northern Europe, Middle Europe, and Subarctic America. Country or state(s): Norway, Svalbard (= Spitsbergen; Norway), Sweden, Austria, and France (excl. Corsica); Greenland.

Ecology: Biotroph; lichenicolous, endosubstratic. Host or Phorophyte Taxonomy: Psora rubiformis.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, globose, forming inside the thallus or mycelium of the host, not emerging, becoming adnate, abundant, 80-100-(125) µm wide, 80-100-(125) µm high, with a black surface. Wall: Not carbonized. Margin: Black, (10)-15-17-(20) µm wide; external filaments absent. Exciple: Hyphae 3.5-9.5 µm wide, not carbonized, dark brown or dark brown. Periphyses: Absent. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Present, distinctly branched, distinctly anastomosed; cells 1-2 µm wide. Hypothecium: Light brown, white, or pale brown.

Asci: Globose, clavate, or broadly cylindrical, not stipitate or distinctly stipitate, (33)-35-50-(52) µm long, (12)-16-19 µm wide; tholus not amyloid; ocular chamber present (distinct in young asci); narrow; dehiscence bitunicate (fissitunicate); exoascus not amyloid, not hemiamyloid; ascoplasm dextrinoid.

Ascospores: Not uniseriate, c. 8 per ascus, spores 8 per ascus, ellipsoid or oval, (10.5)-12-15-(17) µm long, (4)-4.5-5.5-(6) µm wide, obtuse; septa present, transversally septate, 1-transversally septate; lumina more or less of equal size; wall thin, becoming pigmented, hyaline, in Lugol's Solution negative, wall not ornamented.

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