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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 Data set author(s): Cáceres M. Data set not revised; not to be published after submission.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. & Navarro-Rosinés P., Bull. Soc. Linn. Provence 45: 443-450 (1994).

Biogeography: Mediterranean. Continent: Europe. Region(s): South-western Europe. Country or state(s): Corsica (France) and Spain (incl. Andorra & Monaco).

Ecology: Biotroph; lichenicolous; growing on calciferous rock. Host or Phorophyte Taxonomy: Verrucaria nigrescens, V. viridula.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, globose, forming inside the thallus or mycelium of the host, not emerging, 65-120 µm wide, 80-130 µm high, with a black or brown surface. Margin: Black or brown, homogenously pigmented, 12-23 µm wide. Exciple: Paraplectenchymatous; hyphae 2.5-9.5 µm wide, 2.5-6.5 µm long, white, dark brown, or light brownish red. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Present; cells 3-4 µm wide. Hypothecium: White.

Asci: Clavate, distinctly stipitate, 44-47 µm long, 15-19 µm wide; tholus not amyloid; ocular chamber present; dehiscence bitunicate (fissitunicate); exoascus euamyloid (epiplasma I+ reddish yellow), not hemiamyloid.

Ascospores: c. 8 per ascus, spores 8 per ascus, ellipsoid, (10)-12.5-15.5-17.5-(19.5) µm long, (4.5)-5-5.5-6.5-(7.5) µm wide, obtuse; septa present, transversally septate, 1-transversally septate; lumina apically enlarged, constricted at the centre; wall thin, .5 µm wide, not constricted where the septum meets the spore wall, remaining hyaline, hyaline, in Lugol's Solution positive (perispore I+ blue), wall not ornamented, distinctly halonate, i.e., with a thick mucilaginous sheath.

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