Nature Item appeared while fighting magma cube in nether, survival mode

while exploring the nether in the nether update got into a fight against a Magma cube, whilst fighting got 3 items with no name from the Nature category, not really a threat, when thrown go no where, can be put into multiple different stacks and chests, don't disappear when a chest is closed with it  in it, don't seem to have any function besides existing.