Synonymy:
Sphaeria clavulata Schwein., Trans. Am. phil. Soc., New Series 4(2): 188 (1832) [1834]
Xylaria clavulata (Schwein.) Berk. & M.A. Curtis, in Berkeley, J. Linn. Soc., Bot. 10(no. 46): 380 (1868) [1869]
Torrubia clavulata (Schwein.) Peck, Ann. Rep. N.Y. St. Mus. nat. Hist. 28: 70 (1876) [1875]
Cordyceps clavulata (Schwein.) Ellis & Everh., N. Amer. Pyren. (Newfield): 61 (1892)

Cordyceps pistillariiformis Berk. & Broome [as 'pistillariaeformis'], Ann. Mag. nat. Hist., Ser. 3 7: 451 (1861)
Torrubia pistillariiformis (Berk. & Broome) Cooke [as 'pistillariaeformis'], Handb. Brit. Fungi 2: 771 (1871)

Position in classification:
Ophiocordyceps, Ophiocordycipitaceae, Hypocreales, Hypocreomycetidae, Sordariomycetes, Ascomycota, Fungi

Note:
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