giant mushroom weighing 20 kilograms.... found growing on a coffee plantation in southern Mexico. PHOTO: http://img.radio.cz/pictures/c/noviny/houba_mexiko.jpg
seems like that's the original article : http://news.yahoo.com/s/afp/2007071...70710184905;_ylt=AixLnB9HR.HIXcOAAm_lJ_oFO7gF not so new, though.
Mushrooms are composed about 90 % of water, so if that specimen weights 20kg, drying it would mean lose 18kgs of water, thus leaving a 2 kg dried specimen. Why that question? I think there would be better methods of preserving it in all its size, rather than showing a 2kg dried thing.