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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. & Triebel D. (94-11-15). Data set reviewer(s): Kainz C. (00-12-22); to be published after submission; 94-11-15.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Phacopsis. Synonyms: Nesolechia thallicola (Massal.) Massal. 1855. Symmicta Lich.: 75; Scutula thallicola (Massa.) Anzi 1860. Catal. Lich. Sondr.: 115; Mycoblastus thallicolus (Massal.) Trev. 1869. Lichen. Ven. 208; Parmeliaceae Zenker (1827).

Type Information: Basionym: Lecidea thallicola Massal. 1852. Ricerche Lich. : 78, fig. 157.

Taxonomic Literature: Triebel D. & Rambold G. 1988. Cecidonia und Phacopsis (Lecanorales): zwei lichenicole Pilzgattungen mit cecidogenen Arten. Nova Hedwigia 47: 279-309.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Soon sessile, not constricted or slightly constricted at the base, .15-.2 mm in diam.. Margin: Excluded (sometimes), distinct. Disk: Plane to weakly convex, black. Exciple: Brown. Epithecium: Apical cells distinctly swollen; brown or hyaline (nearly). Hymenium: White or pale brown. Hypothecium: Dark brown. Hypothecial Extension: Present.

Ascospores: c. 8 per ascus, 8-11 µm long, (4.5)-5-6.5-(7) µm wide, obtuse; septa absent; wall thin, not ornamented.

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