Selected synonymic references
Ptychocylis calyx var. a: Brandt, 1906-1907
Ptychocylis calyx var. b: Brandt, 1906-1907
Epiplocylis calyx: Jörgensen, 1924; Kofoid and Campbell, 1929
? Epiplocylis labiosa: Kofoid and Campbell, 1929; Balech, 1962b
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