Jelinda, Rhipsalis generally bloom either in the spring or fall and some of them do both. However, they tend to bloom when they want to. On WWW.RHIPSALIS.COM, you will find more information regarding bloom times. I know that R. pilocarpa blooms reliably for me in the fall. When they are growing rapidly, try cutting back on temperature and water for a month and see if buds develop. Mine bloom after taking them out into the spring/summer weather or just after bringing them inside when the temps are dropping and the days getting shorter.
Please try to get some better pics of the "old man" Rhipsalis. The ones so far are just not clear enough to help much with an ID. I'm leaning towards one of the R. baccifera's as it does not look much like the so-called cappiliforma's that I've seen. Baccifera's have a small flower that is easily missed.
Be patient with the blooming. It will happen. I've never had so many blooms as in the past two years. don't be afraid to let them chill a bit (but never freeze or frost), dry out a bit (stems will shrink and wrinkle when they are really thirsty) or reduce lighting for a month or so. That can help trigger blooming. Be sure to check them regularly as flowers do not last long and are not large.
