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Data Set Maintenance: Data set compiled. Data set author(s): Cáceres M. (03-04-22). Data set not revised; not to be published after submission.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).

Taxonomic Literature: Arnold F., Flora 57: 174 (1874); Santesson R., Thunbergia 6: 17 no. 147 (1988).

Biogeography: Northern hemispheric. Continent: Africa, Europe, and Northern America. Region(s): Northern Europe, Southern Africa, South-western U.S.A., South-Central U.S.A., and North and Central Mexico. Country or state(s): Sweden; Cape Province (Eastern & Western Cape; South Africa) (South Africa); Arizona (USA), Nevada (USA), and Northwestern Mexico (Mexico) (Baja California).

Ecology: Biotroph; lichenicolous, endosubstratic; growing on non-calciferous rock or calciferous rock. Host or Phorophyte Taxonomy: Acarospora fuscata, A. schleicheri, Acarospora subg. Phaeothallia spec.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, globose, forming inside the thallus or mycelium of the host (in rows along the margins of the host areoles), soon sessile, with a black surface. Wall: Not carbonized. Margin: Black; external filaments absent.

Ascospores: Not uniseriate, c. 8 per ascus, spores 8 per ascus, ellipsoid, 12-14 µm long, 5 µm wide, obtuse or aciculate; septa present, transversally septate, 1-transversally septate; lumina of equal size or apically enlarged, constricted at the centre; wall thin, laterally constricted where the septum meets the spore wall, remaining hyaline, hyaline, not ornamented.

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