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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 Data set author(s): Cáceres M. Data set not revised; not to be published after submission.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 [512-515] (1994).

Biogeography: Northern hemispheric, alpine. Continent: Europe. Region(s): Middle Europe. Country or state(s): Austria.

Ecology: Biotroph; lichenicolous, endosubstratic. Host or Phorophyte Taxonomy: Catapyrenium daedaleum.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, globose, forming inside the thallus or mycelium of the host, not emerging, becoming adnate, abundant, 75-120 µm wide, with a black surface. Wall: Not carbonized. Margin: Black, 7-15 µm wide; external filaments absent. Exciple: Hyphae 1-3 µm wide, 3.5-8.5 µm long, dark brown. Periphyses: Present. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed; cells 1.5-3 µm wide. Hypothecium: Pale brown.

Asci: Clavate or cylindrical (broadly subcylindrical), not stipitate or distinctly stipitate (shortly stipitate), 35-44 µm long, 11-44 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, ellipsoid, oblong-obtuse, or clavate (subclavate), (8.5)-9-11.8-13.5-(14) µm long, (3)-3.5-4-4.5 µm wide, obtuse; septa present, transversally septate, 1-transversally septate; lumina apically enlarged, constricted at the centre; wall thin, .5-1 µm wide, not 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.

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