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Data Set Maintenance: Data set standard item. Data set author(s): Hertel H. (Knoph J.-G.).

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Porpidia. Lecideaceae Chevall. (1826).

Taxonomic Literature: Knoph J.-G. Vorarbeiten zu einer Monographie der euthallinen Arten der Flechtengattung Porpidia (Porpidiaceae, Lecanorales) Europas, mit besonderer Berücksichtigung des Alpengebietes (Diplomarbeit LMU München 1984)
Gowan S.P. Bryologist 92: 25-59 (1989).

Ecology: Biotroph; lichenized; episubstratic; substrate non-calciferous or calciferous.

Thallus: Crustose, not subdivided parts, areolate (primarily areolate); separate thallus parts (.1)-(.8) mm thick. Thallus Size and Differentiation: Large. Upper Surface: Grey, very rarely red, or white; not sorediate.

Ascocarps: Forming independently from the host thallus or mycelium, becoming adnate or soon sessile, slightly constricted at the base, up to 40 per cm², up to (2.2) mm in diam.. Margin: Excluded, distinct, up to 175 µm wide. Disk: Plane to rarely strongly convex to weakly convex, black, pruinose, pruina abundant. Exciple: Hyphae radiating outwards; 4 µm wide; black or dark brown; not inspersed with crystals. Epithecium: Apical cells brown or brownish yellow, cell pigment HCl+ blue. Hymenium: White. Subhymenium: White. Hypothecium: Dark brown.

Ascospores: Broadly ellipsoid or ellipsoid, (12)-15-20-(25) µm long, 6-8-(9.5) µm wide; wall thick, distinctly differentiated into primary and secondary wall, not ornamented.

Secondary Metabolites: Present, 2'-O-methylmicrophyllinic acid, 2'-O-methylperlatolic acid, confluentic acid, or stictic acid (rarely additional).

Spot Tests: Medulla: K + yellow (carbon dioxide development, rarely yellow solution), C –, PD rarely + orange.

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