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 Data set author(s): Cáceres M. Data set not revised; not to be published after submission.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

Taxonomic Literature: Roux C. & Triebel D., Bull. Soc. Linn. Provence 45:451-542 [511] (1994).

Biogeography: Northern hemispheric. Continent: Europe and Northern America. Region(s): Middle Europe, South-western Europe, South-eastern Europe, South-Central U.S.A., and North and Central Mexico. Country or state(s): Austria, Spain (incl. Andorra & Monaco), and Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia); Colarado (USA), New Mexico (USA), and Northwestern Mexico (Mexico).

Ecology: Biotroph; lichenicolous, endosubstratic. Host or Phorophyte Taxonomy: Lecanora bipruinosa, L. muralis, L. novomexicana, L phaedrophthalma, L. polytropa.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, subglobose, within the ascocarp disks of the host, not emerging, becoming adnate, 40-55 µm wide, 60-75 µm high, with a black surface. Margin: Black, 5-12 µm wide. Exciple: Hyphae 4-9 µm wide, 4-6 µm long, dark brown. Periphyses: Present. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Absent. Hypothecium: White.

Asci: Clavate, not stipitate, 22-31 µm long, 11-15 µm wide; tholus not amyloid; ocular chamber present; dehiscence bitunicate; exoascus not amyloid, not hemiamyloid; ascoplasm not dextrinoid.

Ascospores: Not uniseriate, c. 8 per ascus, spores 8 per ascus, rarely ellipsoid or clavate (subclavate), (8.5)-9-10.5-13-(14) µm long, (3.5)-4-4.6-5-(6) µm wide, obtuse; septa present, transversally septate, 1-transversally septate; lumina more or less of equal size or apically enlarged, constricted at the centre; wall thin, laterally constricted where the septum meets the spore wall, remaining hyaline, hyaline, in Lugol's Solution negative, wall not ornamented, distinctly halonate, i.e., with a thick mucilaginous sheath (halo 0.5-1µm wide).

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