During the taxonomic revision of the genus Macradenia, we observed that a review was needed concerning four names, M. delicatula,M. paraensis, M. regnellii, and M. rubescens, published by the Brazilian botanist João Barbosa Rodrigues. Original illustrations are designated as lectotypes for M. paraensis, Trichopilia multiflora (a synonym of M. paraensis) and M. rubescens. Macradenia rubescens is treated as a synonym of M. surinamensis, the latter lectotypified here using a Wullschlaegel specimen from GOET. A Warming specimen at W is designated as the lectotype of Warmingia eugenii, and W. loefgrenii and M. regnellii, two synonymys of W. eugenii, are lectotypified from specimens at BR and P, respectively. No original material is known for M. delicatula, and, as a result, the precise application of this name is uncertain.