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Data Set Maintenance: Data set compiled. Data set author(s): Cáceres M. @EXCL@ Calatayud V. (02-12-17). Data set not revised; not to be published after submission.

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

Taxonomic Literature: Lücking R. & Vezda A. Willdenowia 28: 181-225 [64-65](1998).

Biogeography: Neotropical, montane and upper montane. Continent: Southern America. Country or state(s): Guyana (independent, South America).

Ecology: Biotroph; lichenicolous; endosubstratic; growing on living leaves. Host or Phorophyte Taxonomy: Bacidia psychotriae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, globose, forming inside the thallus or mycelium of the host (aggregate in gall-like malformations of the host thallus), becoming adnate, .05-.1 mm in diam., with a black surface. Wall: Not carbonized. Margin: Black. Exciple: Not carbonized; brown. Periphyses: Present. Hymenium: Iodine reaction: Lugol’s negative. Interascal Hyphae: Present, distinctly branched, distinctly anastomosed. Hypothecium: Brown.

Asci: Cylindrical, distinctly stipitate, 50-60 µm long, 10-13 µm wide; tholus not amyloid; ocular chamber present (often only observable in young asci); narrow; dehiscence bitunicate (fissitunicate); exoascus not amyloid, not hemiamyloid; ascoplasm dextrinoid (endoascus CR+ orange).

Ascospores: Not uniseriate, c. 8 per ascus, spores 8 per ascus, oblong-obtuse, 13-15 µm long, 4-4.5 µm wide, obtuse; septa present; transversally septate, 3-transversally septate; lumina apically enlarged, constricted at the centre; wall thin, laterally constricted where the septum meets the spore wall, becoming pigmented, dark brown or middle brown, in Lugol's Solution negative, wall not ornamented.

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