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Data Set Maintenance: Data set compiled. Data set author(s): Cáceres M. (03-03-27). Data set not revised; not to be published after submission.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: Henssen A., Symb. Bot. Upsal. 18(1): 1-123 [111-112] (1963).

Biogeography: Northern hemispheric. Continent: Europe, Northern America, Southern America, and Pacific. Region(s): Northern Europe, Middle Europe, South-western Europe, and North-western Pacific Islands. Country or state(s): Finland, United Kingdom, Norway, Sweden, Austria, Germany, France (excl. Corsica), and Portugal; Central Russia and Japan; Greenland; Southeastern Brazil (Brazil).

Ecology: Biotroph; lichenicolous, endosubstratic. Host or Phorophyte Taxonomy: Ephebe brasiliensis, E. japonica, E. hispidula, E. lanata.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, globose or subglobose, forming inside the thallus or mycelium of the host, not emerging, abundant, 60-120 µm wide, 70-125 µm high, with a black surface. Wall: Not carbonized. Margin: Black, 10-30 µm wide; external filaments absent. Disk: Smooth. Exciple: Paraplectenchymatous; not carbonized, brown. Periphyses: Present. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Absent. Hypothecium: Brown.

Asci: Obclavate, indistinctly stipitate, 35-45 µm long, 12-13 µm wide; tholus not amyloid; ocular chamber indistinct; dehiscence bitunicate; ascoplasm not dextrinoid.

Ascospores: Not uniseriate, c. 8 per ascus, spores 8 per ascus, ellipsoid, 16-20 µm long, 4-5 µm wide, obtuse; septa present, transversally septate, 1-transversally septate; lumina of equal size; wall thin, laterally constricted where the septum meets the spore wall, hyaline, in Lugol's Solution negative, wall not ornamented.

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