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Data Set Maintenance: Data set compiled. Data set author(s): Cáceres M. (02-02-25). Data set not revised; not to be published after submission.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Polycoccum. Dacampiaceae Körb. (1855); Dothideales.

Taxonomic Literature: Hawksworth D. L., Lichenologist 26(4): 337-347 [342-344] (1994).

Biogeography: Northern hemispheric. Continent: Europe. Region(s): Middle Europe. Country or state(s): United Kingdom (England).

Ecology: Biotroph; lichenicolous; endosubstratic; growing on bark. Host or Phorophyte Taxonomy: Xanthoria parietina.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, subglobose, forming inside the thallus or mycelium of the host (single perithecia almost immersed in tuberculiform galls), within the ascocarp margin of the host or within the ascocarp disks of the host, becoming adnate, (.15)-.2-.3 mm in diam., 150-200-(250) µm wide, with a black surface. Margin: Black, (12)-15-20 µm wide. Exciple: Paraplectenchymatous; hyphae 6-10 µm wide; dark brownish red. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Present, distinctly branched, distinctly anastomosed; cells 1.5-2 µm wide.

Asci: Narrowly cylindrical, 100-110 µm long, (6)-6.5-7 µm wide; dehiscence bitunicate (fissitunicate).

Ascospores: c. 8 per ascus, spores 8 per ascus, ellipsoid, 13-14.5 µm long, 5-6-(7.5) µm wide, obtuse; septa present; transversally septate, 1-transversally septate; lumina more or less of equal size; wall laterally constricted where the septum meets the spore wall (slightly constricted), becoming pigmented, dark reddish brown, ornamented.

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