Discocactus piscibarbarus
- Holotype: Brazil, Minas Gerais, Município Rio Pardo de Minas, c.5km S of Nova Aurora village, on ± naked canga (iron ore) in the valley of the Rio Peixe Bravo, 2012, G. Olsthoorn 353 (UB)
- 1. Taylor, N., Zappi, D., Olsthoorn, G., Lowry, M. & Pereira, F. 2023: Additions and corrections to Cacti of Eastern Brazil (3). – Bradleya 41. http://doi.org/10.25223/brad.n41.2023.a7