BioStor
 | Fragmente zur Mykologie (XIII. Mitteilung, Nr. 642 bis 718) (1911) Sitzungsber. K. Akad. Wiss., Math.-Naturwiss. Kl. 120: 379-484 |
 | An Analysis of the Flora of Southern Africa: Its Characteristics, Relationships, and Orgins Peter Goldblati (1978) Annals of the Missouri Botanical Garden 65: 369-436 |