PLATE 23
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| Fig. | Page | |
| GYROSIGMA | ||
| 1 | Gyrosigma strigilis (Wm. Sm.) Cl. | [76] |
| 2 | Gyrosigma balticum (Ehr.) Cl. | [75] |
| 3 | Gyrosigma hippocampus (Ehr.) | [75] |
| 4 | Gyrosigma simile (Grun.) | [76] |
| 5 | Gyrosigma acuminatum (Kuetz.) Cl. | [76] |
| 6 | Gyrosigma scalproides (Rab.) Cl. | [76] |
| 7 | Gyrosigma parkeri var. stauroneioides Grun. | [75] |
| 8 | Gyrosigma spencerii var. nodifera Grun. | [76] |
| 9 | Gyrosigma fasciola (Ehr.) Cl. | [77] |
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