Synonymy:
Agaricus caput-medusae Fr., Epicrisis Systematis Mycologici: 216 (1838) [1836-1838]
Stropharia caput-medusae (Fr.) P. Karst., Bidr. Känn. Finl. Nat. Folk 32: 493 (1879)
Geophila caput-medusae (Fr.) Quél., Enchiridion Fungorum in Europa media et praesertim in Gallia Vigentium: 112 (1886)
Fungus caput-medusae (Fr.) Kuntze, Revis. gen. pl. (Leipzig) 3(3): 479 (1898)
Psalliota caput-medusae (Fr.) Henn., in Engler & Prantl, Nat. Pflanzenfam. (Leipzig) 1(1**): 238 (1898)
Hypholoma caput-medusae (Fr.) Ricken, Die Blätterpilze: 243 (1912)

Agaricus jerdonii Berk. & Broome [as 'jerdoni'], Ann. Mag. nat. Hist., Ser. 3 7: 375 (1861)
Stropharia jerdonii (Berk. & Broome) Sacc., Syll. Fung. (Abellini) 5: 1025 (1887)
Fungus jerdonii (Berk. & Broome) Kuntze, Revis. gen. pl. (Leipzig) 3(3): 480 (1898)
Psalliota jerdonii (Berk. & Broome) Henn., in Engler & Prantl, Nat. Pflanzenfam., Teil. I (Leipzig) 1(1**): 238 (1898) [1900]
Psathyrella jerdonii (Berk. & Broome) Konrad & Maubl., Encyclop. Mycol. (Paris) 14: 127 (1949) [1948]
Drosophila jerdonii (Berk. & Broome) J. Favre, in Kühner & Romagnesi, Schweiz. Z. Pilzk. 36: 70 (1958)

Stropharia caput-medusae var. alba P. Karst., Meddn Soc. Fauna Flora fenn. 9: 47 (1883)

Stropharia caput-medusae var. depauperata J.E. Lange, Dansk bot. Ark. 4(no. 4): 35 (1923)
Drosophila caput-medusae var. depauperata (J.E. Lange) Kühner & Romagn., Fl. Analyt. Champ. Supér. (Paris): 371 (1953)
Psathyrella caput-medusae var. depauperata (J.E. Lange) Bon, Docums Mycol. 12(no. 48): 52 (1983) [1982]

Position in classification:
Psathyrella, Psathyrellaceae, Agaricales, Agaricomycetidae, Agaricomycetes, Basidiomycota, Fungi

Note:
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