Philodendron callosum is a species of flowering plant in the family Araceae. An epiphyte, it is native to wet forests of northern South America. Its floral scents dihydro-β-ionone and 2-hydroxy-5-methyl-3-hexanone serve to attract its pollinators, scarab beetles of the genus "Cyclocephala". With its leathery, glossy leaves it has found use as a houseplant. 
Subtaxa.
The following subspecies are accepted: