Classification of the subgenus Murchisonia (Ptychocaulus)
G. †Ptychocaulus Perner 1907
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†Ptychocaulus bivittata Hall 1852
†Ptychocaulus crumena Perner 1907
†Ptychocaulus magna Karczewski 1980
†Ptychocaulus rodneyi Rohr 1980
†Ptychocaulus verneuili Koken 1889
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Invalid names: Ptychocaulus approximans Perner 1907 [synonym], Ptychocaulus brevicona Perner 1907 [synonym]