Does anyone know the species of this epiphytic cactus? Even the genus would be a step forward. Could it be a Disocactus sp.?
The open flower is less than 2 cm (just under an inch) in diameter. The colours on the photo look pretty realistic.
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I believe this to be Pfeiffera monacantha.
Synonym(s): Rhipsalis monacantha, Acanthorhipsalis monacantha, Pfeiffera monacantha, Acanthorhipsalis incahuasina, Pfeiffera incahuasina, Acanthorhipsalis monacantha, Lepismium monacanthum.
In regards to its taxonomy, the International Plant Names Index (http://www.ipni.org) shows that the generic name Lepismium was changed to Pfeiffera in 1994 (and nothing about it changing back to Lepismium).
To fortify this, The New Cactus Lexicon (http://www.newcactuslexicon.org/) reaffirms the genus Pfeiffera with 9 species.
Details about its range and and taxonomy can be found here: http://media.eol.org/pages/5181624/hierarchy_entries/57218552/overview