J.Dransf. & J.B.Comber 1986 - Dransfield J, Comber JB, Smith G (1986) A Synopsis of Corybas (Orchidaceae) in West Malesia and Asia. Kew Bulletin 41(3): 575-613. doi: 10.2307/4103118.
There is no corrections for Corybas umbrosus yet.