This is growing in my yard. What can you tell me about it??
This is a fungus/mushroom/puffball. It is a giant puffball. It looks a little odd because the outer covering stopped growing before the interior stopped growing resulting the in the splitting open of the puffball. Here is a link to more information about puffballs including the giant puffballs: http://americanmushrooms.com/edibles3.htm
It is not consider to be poisonous.