New species and nomenclatural changes in Bulbophyllum (Orchidaceae) from Madagascar

Six new species: Bulbophyllum caniceps, B. cochinealloides, B. fierenanaense, B. geminiflorum, B. oenanthum and B. rudolphus are described for the first time. The identity and nomenclature of Bulbophyllum cylindrocarpum is discussed and its var. andringitrense is recognised at species rank as B. jeanbosseri. Bulbophyllum aubrevillei and B. kieneri are compared with the latter becoming a synonym. The history and identities of Bulbophyllum pentastichum vs B. quadrifarium are clarified and the necessary taxonomic changes and type selections are made. A new sect. Inversiflora is formally described.

Automated summary

This paper describes six new species of Bulbophyllum for the first time and discusses the identity and nomenclature of several existing species. It also makes necessary taxonomic changes and selections, while formally describing a new section of the genus.