Zygocactus - Schlumbergera bridgesii

Zygocactus natural habitat is the rain forest of Brazil. In the rainforest, they grow high up in the top of the trees clinging to the trees with aerial roots. 
 
Zygocactus is definitely not as drought tolerant as most other cacti. They like high rain forest humidity, not desert dryness. However, look at those segmented stem leaves. They are succulent and can store water, so, be careful not to overwater them either. Though, water requirements increase during the flowering period.
 
Currently not in bloom.