Name that plant-in Amano

On page 24 of Amano's book, Nature Aquarium World, there's a plant in the
background that I have but can't name. It's the long stringy green plant
with short spiky leaves that is curving toward the center of the photo.

Can anyone name that plant? TIA.

Greg. Tong
San Francisco, CA, USA
gtong at sirius_com

"Every infinity is composed of only two halves."