I haven't been able to identify this house plant. Its leaves have a really beautiful pattern, as such:
It has been watered regularly, is in the sunlight every day, but the leaves are furling and yellowing inexplicably, and the stems are falling limply:
Inside the pot cover, the plant is inside a black plastic pot, sat atop an upside down pot that was trimmed, so the pot doesn't soak in water at the moment.
I thought that maybe it needed to be placed in a larger pot, so I took it out of the black plastic pot, and noticed the roots were very dense. At the bottom of some of the roots, there seemed to be bulbs. I wasn't able to find a larger pot at the time, three days ago.
I recently gave the pot new soil and plant food and yet it is still looking sad.
What does this plant need?