DISOCACTUS
Treat as an epiphyllum.
https://www.exoticaesoterica.com/cactus-and-succulents/2018/8/1/rare-and-colorful-epiphytic-cacti
https://www.cactusexpert.org/cultivation-of-cacti/disocactus.html
http://mattslandscape.com/detail/?plant_name=Disocactus%20nelsonii
https://adamsjunglecacti.com.au/products/disocactus-nelsonii-hybrid-413
http://mattslandscape.com/detail/?plant_name=Disocactus%20macranthus
https://en.hortipedia.com/Disocactus_biformis
DISOCACTUS QUEZALTECUS & OTHERS
https://www.exoticaesoterica.com/cactus-and-succulents/2018/8/1/rare-and-colorful-epiphytic-cacti
https://cactus-epiphytes.eu/z_photo_427_1v_p33.html
On line guide to identification
https://cactiguide.com/cactus/?uname2=Bonifazia%20quezalteca
http://www.llifle.com/Encyclopedia/CACTI/Family/Cactaceae/7835/Epiphyllum_crenatum
DISOCACTUS SPECIOUS BIERIANUS (Treat as epiphyllum, but with less direct sun)
https://plants.jstor.org/stable/10.5555/al.ap.specimen.k000447186
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DISOCACTUS SPECIOUS
https://plantingman.com/disocactus-speciosus/
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http://www.llifle.com/Encyclopedia/CACTI/Family/Cactaceae/8517/Disocactus_phyllanthoides
