Mushrooms in planting containers

OK, so I have a pot filling up with shrooms. I just planted my cucumber seedlings in it a couple of days ago and today it is about 1/4 full of mushrooms. What's up with this? The planting mix is Sta-Green vegetable and flower planting mix. I thought these mixtures were sterilized. Is this a sign of something bad? I have no idea how the soil could have gotten inoculated with spores. The weather has been pretty warm and dry and not exactly good mushroom conditions.
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Not to worry. The 'Shrooms are decomposers and will convert the organic material in the soil into plant food.
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- Billy
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