| 1900 Peridium longispinum - Jørgensen pp. 75-76 |
| 1905 Peridium longispinum - Jørgensen p. 135; pl. 15, figs. 75-79; pl. 16, fig. 80 |
| 1976 Peridium longispinum - Bjørklund pl. 7, figs. 9-15 |
| 1995 Peridium longispinum - Schröder-Ritzrau pl. 6, fig. 3-4 |
| 1998 Peridium longispinum - Bjørklund et al. pl. 2, figs. 26-27 |
| 1998 Peridium longispinum - Dolven pl. 12, fig. 5 |
| 2003 Peridium longispinum - Bjørklund and Kruglikova p. 245 (not figured) |
