this
site has a list of all the species, broken down into the continents where they are found and also their natural environment.
this
second site has a pretty good cultivation guide.
P. wallichii, P. quadridichotomum and P. stemmaria are those that goes into/requires a dry dormancy. P. andinium i've not been able to be certain if it requires/goes into dry dormancy but i didn't want to take the risk.
i have about 12 of these fellas and i'm already at a loss of what to do with them when they get bigger.
