Philodendron selloum 'Atom'
Native range: Brazil, Bolivia, Argentina, Paraguay
Known names: Philodendron bipinnatifidum, Horse Head Philodendron, Lacey Tree Philodendron
Hardiness: Best kept above 50°F
Mature Size: Clump growing to around 1.5ish foot x 2ish feet. 
Light: Bright indirect light - half day sun.
Water: Let soil dry out slightly between watering.
Soil: Standard potting mix
Dormancy Period: N/A
Pet-Safe: No
Plant Size: Grown in 4" pot, shipped semi-bare-root
 
Philodendron selloum 'Atom' is a fairly newly released cultivar!
It remains quite compact and quite small, great for window-side growing. Leaves are more palmate with age.