The Book of Lost Tales, Part One (The History of Middle-Earth, #1)

by J.R.R. Tolkien

Then did the Gods praise Vána and Palúrien and rejoice in the light, saying to them: “Lo, this is a very fair tree indeed, and must have a name unto itself,” and Kémi said: “Let it be called Laurelin, for the brightness of its blossom and the music of its dew,” but Vána would call it Lindeloksë, and both names remain.

Amidst of these was a great green sward of grass smooth as a web of stuffs,

What is a "web of stuffs"?