Orchid taxonomy and naming authority?

[DavidCampen]

Is Kew/RHS the generally accepted authority for for classifying orchids by genus and species? Where are these decisions published?

What got me wondering is I recently purchased a Cattleya deckeri but Orchidwiz stubbornly insists that this is just a pseudonym for Catleya skinneri and cites KEW/RHS as the authority for this.

OTOH, Carl Withner in "The Cattleyas and their Relatives, Vol. I" clearly considers deckeri to be a distinct and separate species.