By the way you guys should check out this site! A social spore print exchange network for microscopy use, but to generate more spore prints you of course have to grow some mushrooms.
http://fsre.nl/home/
With me spores never spoiled other shrooms... I did once have a yellow oyster mushroom flush that all of a sudden shrunk/crumbled, that night it was very cold or it might have been a moisture issue.
Here is a picture with mushrooms that are staining black from all the spores on them not giving a actual f**k:
http://img.photobucket.com/albums/v285/starseed1066/shroom/8bee2ee0.jpg
My experience is cubensis strains die very quickly outside in western Europe. You should try the p Azurescens, they do very well in a colder climate. Also they produce more psilocybin.
http://www.fungi.com/info/gallery/psilochart.html
http://www.shroomery.org/forums/showflat.php/Number/13477272#13477272