What Spider Uses a Leaf as a Weight?

[davedotcom]

No, that's not the build up to a punchline!

Last year, my wife and I were walking through Sherwood Forest when I noticed an amazing spiders web, unfortunately didn't have my camera to get a shot.

The web spanned over the footpath between the branches of two trees, maybe a couple of feet across. However the thing that amazed me was that there was a leaf hanging from the bottom web by a single thread. The leaf was about nine feet high with a good 12 inches of thread.

I assume that this was done to create a weight to retain tension in the web, however I've never heard of or seen this before (but not surprised if true).

Is there one particular species of spider that will do this or do numerous use this skill?

[No.9 Spider]

I don't think in this instance, as genius as some spiders are, that the leaf is intended as a weight and is probably caught there by chance. A leaf, though heavy in comparison to web, may act as a weight but has more detrimental factors mainly in the wind catching the leaf and thereby tangling and destroying the web
There are spiders that will attach groundlines to small pebbles as anchorage for their web and these pebbles will sometimes lift of the ground due to tension and are then suspended above the ground, but I can't see the leaf being an integral part of the spiders design.