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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 Data set not revised; not to be published after submission.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 [112-113] (1963) - sub Pharcidia parva.

Biogeography: Northern hemispheric. Continent: Europe and Northern America. Region(s): Northern Europe, Middle Europe, and South-eastern U.S.A. Country or state(s): Finland, Sweden, and France (excl. Corsica); Colarado (USA), New Hampshire (USA), Georgia (USA), North Carolina (USA), and Virginia (USA).

Ecology: Biotroph; lichenicolous, endosubstratic. Host or Phorophyte Taxonomy: Ephebe americana, E. hispidula, E. lanata, E. solida; Zahlbrucknerella calcarea.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, subglobose, forming inside the thallus or mycelium of the host, becoming adnate to more or less soon sessile, 64-66 µm wide, 70-85 µm high, with a brown surface. Wall: Not carbonized. Margin: Brown, inhomogenously pigmented, 9-15 µm wide; external filaments absent. Disk: Smooth. Exciple: Paraplectenchymatous; not carbonized, brown to white. Periphyses: Present. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Absent. Hypothecium: White.

Asci: Cylindrical to obclavate, indistinctly stipitate, 33-35 µm long, 9999-(IMPORT PROBLEM, please resolve following string manually: '5´.5' (The current numeric data 9999 are inserted only as a placeholder and should be discarded))-9 µm wide; tholus not amyloid; dehiscence bitunicate; exoascus not amyloid, not hemiamyloid; ascoplasm not dextrinoid.

Ascospores: Not uniseriate, c. 8 per ascus, spores 8 per ascus, ellipsoid, 11-13 µm long, 2.5-3.5 µm wide, obtuse; septa present, transversally septate, 1-(2)-transversally septate; lumina apically enlarged, constricted at the centre; wall thin, not constricted where the septum meets the spore wall, hyaline, in Lugol's Solution negative, wall not ornamented.

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