Oh well, I thought. I'll give it a try. After all, we are talking about a life form. How delicate and susceptible to the cold could it be?
Although slow, I finally got some growth. It took a full 15 days longer than I had read about in books. This is probably due to some spores being frozen. Or it could be due to me inoculating towards the inner body of the substrate, so that it effectively grew from the inside out... leading to delayed visual results.
In about a week or two, I should have a fully-colonized set of jars to take to the next step of mushroom growing, the step called "dunking". Good thing I am a super patient person. Wink.