Synonymy:
Calicium claviculare var. pusillum Ach., K. Vetensk-Acad. Nya Handl. 29: 279 (1808)
Calicium pusillum (Ach.) Flörke, Deutsche Lich. 7: 6 (no. 188) (1821)
Cyphelium pusillum (Ach.) A. Massal., Memor. Lich.: 158 (1853)
Calicium floerkei Zahlbr., Cat. Lich. Univers. 1: 598 (1922)
Mycocalicium pusillum (Ach.) Räsänen, Ann. bot. Soc. Zool.-Bot. fenn. Vanamo 3(no. 8): 348 (1926)

Calicium subpusillum Vain., Acta Soc. Fauna Flora fenn. 57(no. 1): 50 (1927)
Chaenothecopsis subpusilla (Vain.) Tibell, Symb. bot. upsal. 21(no. 2): 47 (1975)

Position in classification:
Chaenothecopsis, Mycocaliciaceae, Mycocaliciales, Mycocaliciomycetidae, Eurotiomycetes, Ascomycota, Fungi

Note:
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