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Data Set Maintenance: Data set compiled. Data set author(s): Cáceres M. (03-03-18). Data set not revised; not to be published after submission.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: Hafellner J., Bull. Soc. Linn. Provence 44:219-234 [231] (1994).

Biogeography: Northern hemispheric, Mediterranean. Continent: Europe. Region(s): Middle Europe. Country or state(s): France (excl. Corsica).

Ecology: Biotroph; lichenicolous, endosubstratic; growing on bark. Host or Phorophyte Taxonomy: Xanthoparmelia somloensis, X. tinctina.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, globose, forming inside the thallus or mycelium of the host, soon sessile, moderately abundant, 60-80 µm wide, with a black surface. Wall: Not carbonized. Margin: Lecideine/biatorine, smooth, black, homogenously pigmented; external filaments absent. Disk: Smooth. Exciple: Not carbonized, dark brown. Periphyses: Absent. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid (in mature ascomata). Interascal Hyphae: Absent. Hypothecium: Dark brown.

Asci: Broadly clavate (saccate), distinctly stipitate (shortly stipitate), 30-40 µm long, 13-16 µm wide; tholus not amyloid; dehiscence bitunicate (fissitunicate); exoascus not amyloid, not hemiamyloid.

Ascospores: Not uniseriate, c. 8 per ascus, spores 8 per ascus, ellipsoid, 13-15-16 µm long, 4-5-5.5 µm wide, obtuse; septa present, transversally septate, 1-transversally septate; lumina of equal size or apically enlarged, constricted at the centre; wall thin (young ascospores), becoming pigmented, hyaline, in Lugol's Solution positive, wall not ornamented (young ascospores) or ornamented (mature ascospores).

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