Synonymy:
Lichen membranaceus Dicks., Fasc. pl. crypt. brit. (London) 2: 21 (1790)
Parmelia caperata var. membranacea (Dicks.) Schaer., Lich. helv. spicil. 10: 471 (1840)
Leproloma membranaceum (Dicks.) Vain., Term. Füz. 22: 293 (1899)
Dictyolus membranaceus (Dicks.) Maire, Bull. Séanc. Soc. Sci. Nancy, Sér. 3 7: 25 (extr.) (1905)
Crocynia membranacea (Dicks.) Zahlbr., Cat. Lich. Univers. 2: 575 (1923) [1924]
Crocynia lanuginosa var. membranacea (Dicks.) M. Choisy, Icon. Lich. Univ., fasc. 2 (Lyon): tab. 7 (1930)

Lichen lanuginosus Ach., Lich. suec. prodr. (Linköping): 120 (1799) [1798]
Parmelia lanuginosa Ach., Methodus qua omnes detectos Lichenes Secundum Organa Carpomorpha ad Genera, Species et Varietates Redigere atque Observationibus Illustrare Tentavit Erik Acharius: 207 (1803)

Imbricaria lanuginosa (Ach.) DC., Fl. franç., Edn 3 (Paris) 5/6: 188 (1815)
Amphiloma lanuginosum (Ach.) Nyl., Mém. Soc. Imp. Sci. Nat. Cherbourg 3: 176 (1855)
Lecanora lanuginosa (Ach.) Branth & Rostr., Bot. Tidsskr. 3: 194 (1869)
Psoroma lanuginosum (Ach.) Müll. Arg., Bull. Herb. Boissier 2(app. 1): 42 (1894)
Placodium lanuginosum (Ach.) Müll. Arg., Bot. Jahrb. Syst. 20(1-2): 265 (1894)
Crocynia lanuginosa (Ach.) Hue, Mém. Soc. natn. Sci. nat. Cherbourg 37: 229 (1909)

Crocynia lanuginosa var. albescens B. de Lesd., in Hue, Bull. Soc. Bot. France 71: 363 (1924)
Crocynia membranacea var. albescens (B. de Lesd.) Zahlbr., Cat. Lich. Univers. 8: 240 (1932)

Crocynia lanuginosa var. inactiva B. de Lesd. ex Hue, Bull. Soc. Bot. France 71: 355 (1924)
Crocynia membranacea var. inactiva (B. de Lesd. ex Hue) Zahlbr., Cat. Lich. Univers. 8: 240 (1932)

Position in classification:
Lepraria, Stereocaulaceae, Lecanorales, Lecanoromycetidae, Lecanoromycetes, Ascomycota, Fungi

Note:
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