Hello,

My plant app identified this as possibly a Philodendron hederaceum, but none of the pictures of that species I've found have the red and green leaves -- just green, and they don't look exactly similar. Is this the same species though?

Yes, that is a Velvet Leaf Philodendron (Philodendron hederaceum)

Its Philodendron micans

As Gina1960 stated, it may be Velvet Leaf Philodendron (Philodendron hederaceum var. hederaceum) synonym Philodendron micans.

Thank you all!

I think the red ones are old ones getting ready to fall off. They're green with a red overlay that remains when the chlorophyll dies so they still look red.

Gina1960 said: Um no they aren't. They are a different variety. I have both growing in my greenhouse. The regular hederaceum green form never has red abaxials even when the leaf is dying. The Micans comes out with red

I'd totally forgotten that fact but yes, as Gina mentioned, the way to tell the difference between the two:

Velvet Leaf Philodendron (Philodendron hederaceum)
Upper and Lower leaf surfaces are both green.

Velvet Leaf Philodendron (Philodendron hederaceum var. hederaceum)
Upper leaf surface is green and Lower leaf surface is reddish in color.