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Data Set Maintenance: Data set compiled. Data set author(s): Cáceres M. (01-09-05). Data set reviewer(s): Triebel D.; revised; to be published after submission.

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

Taxonomic Literature: Arnold F.G.C., Ber. Bayer. Bot. Ges. 1 (Anh.): 132 (1891); Hawksworth
D.L. & Diederich P., Trans. Brit. Mycol. Soc. 90: 293-312 [302-303] (1988); Kocourková J., Acta Mus. Nat. Pragae, Ser. B, Hist. Nat. 55(3-4): 59-169 [112] (2000).

Biogeography: Northern hemispheric. Continent: Europe and Northern America. Region(s): Northern Europe, Middle Europe, and South-western Europe. Country or state(s): United Kingdom (British Isles and Ireland), Norway, Sweden, Austria, Benelux (Belgium & Luxembourg) (Luxembourg), former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, and Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia); Greenland and California (USA).

Ecology: Biotroph; lichenicolous. Host or Phorophyte Taxonomy: Acarospora fuscata, Acarospora sp.; Buellia stellulata; Ionaspis lacustris; Rhizocarpon disporum, (?) Rhizocarpon sp.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, forming inside the thallus or mycelium of the host, not emerging, (50)-100-150 µm wide. Periphyses: Absent. Interascal Hyphae: Present, distinctly branched, distinctly anastomosed; cells 1.5-2.5 µm wide.

Asci: Broadly cylindrical, 65-90 µm long, 10-12 µm wide; dehiscence bitunicate.

Ascospores: Not uniseriate (biseriate) or irregularly uniseriate, c. 8 per ascus, spores 4-8 per ascus, ellipsoid, 14-18 µm long, 7-8.5 µm wide; septa present; transversally septate, 1-transversally septate; lumina more or less of equal size or apically enlarged, constricted at the centre; wall dark brown, ornamented (generally coarsely verruculose).

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