Novitates Gabonenses 78. Two new species from Gabon in the Bridelieae (Phyllanthaceae, formerly Euphorbiaceae) with keys for Gabonese species within genera Bridelia and Cleistanthus. In the framework of the taxonomic treatment of the Phyllanthaceae for the Fiore du Gabon, two new species of Bridelieae are described, one in the genus Bridelia, the other in the genus Cleistanthus. The new species are illustrated, their distribution maps are provided, and their taxonomic position within their respective genera is discussed. An assessment of their conservation status is provided. Identification keys for the Gabonese species of Bridelia and Cleistanthus are added.