Holttum (Ridl.) 1960 - Holttum RE (1960) The Genera Sarcochilus R. Br. and Pteroceras Hassk. (Orchidaceae) with Notes on Other Genera Which Have Been Included in Sarcochilus. Kew Bulletin 14(2): 263-276. doi: 10.2307/4114807.
There is no corrections for Pteroceras violaceum yet.