Synonymy:
Calicium pusiolum Ach., K. Vetensk-Acad. Nya Handl. 5: 231 (1817)
Phacotium pusiolum (Ach.) Trevis., Flora, Regensburg 45(1): 6 (1862)
Calicium pusillum subsp. pusiolum (Ach.) Vain., Meddn Soc. Fauna Flora fenn. 6: 96 (1881)
Calicium pusillum var. pusiolum (Ach.) Harm., Lich. Fr. 2: 183 (1905)
Mycocalicium pusiolum (Ach.) Räsänen, Ann. bot. Soc. Zool.-Bot. fenn. Vanamo 3(no. 8): 343 (1926)

Calicium lignicola Nádv. [as 'lignicolum'], Preslia 18-19: 128 (1940)
Chaenothecopsis lignicola (Nádv.) A.F.W. Schmidt, Mitt. Staatsinst. Allg. Bot. Hamburg 13: 153 (1970)

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

Note:
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