| Mihai Costea | Wilfrid Laurier University Herbarium | Waterloo, Canada |
| Robert W. Johnson | Queensland Herbarium (BRI) | Brisbane, Australia |
| Maria Teresa Buril Vital | Universidade Estadual de Feira de Santana | Bahia, Brazil |
| H.E. Dillewaard | Queensland Herbarium (BRI) | Brisbane, Australia |