| Détermination du spécimen | Collecteur | Numéro | Station de collecte |
|---|---|---|---|
| Isolona zenkeri Engl. | Arends J.C. | 451 | slope at the waterfall in the Waka River. |
| Isolona zenkeri Engl. | de Wilde J.J.F.E. | 8884 | Crystal Mountains, c. 3 km along the track Alen Nkomo-Andok Foula. |
| Isolona zenkeri Engl. | de Wilde J.J.F.E. | 9066 | 34 km along an exploitation track in NW direction from Doussala. |
| Isolona zenkeri Engl. | de Wilde J.J.F.E. | 11554 | SW of Fougamou, massif de Koumounabwali. |
| Isolona zenkeri Engl. | Lachenaud | 1442 | Mabounié, piste du nord-est. |
| Isolona zenkeri Engl. | Maesen | 5829 | 1.5 km E of Lastoursville Railway bridge. |
| Isolona zenkeri Engl. | Sosef | 2250 | Libreville, Sibang Arboretum. |
| Isolona zenkeri Engl. | Sosef | 2291 | Doudou Mountains National Parc, c. 5 km S of Camp Peny (CBG). |
| Isolona zenkeri Engl. | Sosef | 2322 | Doudou Mountains National Parc, c. 40 km S of Mandji. |
| Isolona zenkeri Engl. | Thomas D.W. | 6342 | Libreville, Sibange Arboretum. |
| Isolona zenkeri Engl. | Wieringa J.J. | 6225 | c. 60 km N of Lastoursville, Milolé logging concession of CEB (UFA2-UFG2-lot 2), foothills of Ngota Mountain. |
| Isolona zenkeri Engl. | Wieringa J.J. | 6248 | c. 60 km N of Lastoursville, Milolé logging concession of CEB (UFA2-UFG2-lot 2), top of Ngota Mountain. |
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