Does anybody know what this is?

Has anybody got any idea what this is in our front lawn? These orange things seem to be spreading (especially when it's sunny) and we've got a ten year old who loves picking grass so I'm worried that he's going to be poisoned by whatever this is?

Help!

 

I've done a bit more research and, for anybody who may want to know, the fungus is a 'fairy club fungus' called clavulinopsis luteoalba. Now I just have to find out what to do about it - none of the websites that identify it give any suggestions as to how to get rid of it - any ideas gratefully received