Van Heurck -- Synopsis des Diatomées de Belgique -- Index
| Plagiotropis | elegans (W.Sm.) Grunow | Page 122 | Plate 22 | Figure 1,6 | |
| Plagiotropis | gibberula Grunow | Page -- | Plate 22bis | Figure 12,13 | Note 186 |
| Plagiotropis | mediterranea Grunow | Page -- | Plate 22 | Figure 14 | Note 187 |
| Plagiotropis | vanheurckii Grunow | Page 122 | Plate 22bis | Figure 6,7,8 | |
| Plagiotropis | vitrea (W.Sm.) Grunow | Page -- | Plate 22 | Figure 7,8,9 | Note 188 |