Synonymy:
Peziza firma Pers., Syn. meth. fung. (Göttingen) 2: 658 (1801)
Calycina firma (Pers.) Gray, Nat. Arr. Brit. Pl. (London) 1: 670 (1821)
Cenangium firmum (Pers.) De Not., Comm. Soc. crittog. Ital. 1(fasc. 5): 31 (1863) [1864]
Helotium firmum (Pers.) P. Karst., Not. Sällsk. Fauna et Fl. Fenn. Förh., Ny Ser. 11: 233 (1870) [1871]
Ciboria firma (Pers.) Fuckel, Jb. nassau. Ver. Naturk. 23-24: 312 (1870) [1869-70]
Phialea firma (Pers.) Gillet, Champignons de France, Discom.(4): 101 (1881) [1879]
Hymenoscyphus firmus (Pers.) W. Phillips [as 'Hymenoscypha'], Man. Brit. Discomyc. (London): 123 (1887)
Poculum firmum (Pers.) Dumont, Mycologia 68(4): 870 (1976)

Peziza ochroleuca Bolton, Hist. fung. Halifax (Huddersfield) 3: 105 (1790) [1789]
Ciboria ochroleuca (Bolton) Massee, Brit. Fung.-Fl. (London) 4: 274 (1895)

Peziza flavescens Holmsk., Beata Ruris Otia FUNGIS DANICIS 2: 27 (1799)
Peziza firma subsp. flavescens (Holmsk.) Pers., Mycologia Europaea (Erlanga) 1: 277 (1822)
Helotium virgultorum var. flavescens (Holmsk.) Berk., Outl. Brit. Fung. (London): 372 (1860)

Ciboria firma var. acuum Feltgen, Vorstud Pilzfl. Luxemb., Nachtr. III: 46 (1903)

Position in classification:
Rutstroemia, Rutstroemiaceae, Helotiales, Leotiomycetidae, Leotiomycetes, Ascomycota, Fungi

Note:
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