Disocactus

Disocactus is a genus of epiphytic cacti in the tribe Hylocereeae found in Central America, the Caribbean and northern South America. It should not be confused with "Discocactus", which is a different genus.
Species of "Disocactus" grow in tropical regions either on trees as epiphytes or on rocks as lithophytes. They have two distinct growth habits. Species such as "D. phyllanthoides" have stems which are round at the base but then become flattened and leaflike.
Many of the cultivated plants known as epiphyllum hybrids or just epiphyllums are derived from crosses between species of "Disocactus" (rather than "Epiphyllum") and other genera in the Hylocereeae.
Taxonomy.
Synonymy.
The boundaries of the genera in the tribe Hylocereeae have been subject to considerable change and uncertainty, which is reflected in the number of names which have been used for "Disocactus":
"Pseudorhipsalis" is sometimes included in "Disocactus", but it is kept separate by the International Cactaceae Systematics Group. "Aporocactus" is formerly included in "Disocactus", but it should be a genus on its own according to molecular evidence.
Species.
, Plants of the World Online accepted the following species: