Here's the follow-up to this story...
I cut out the green mold part with a sterilized spoon and poured one teaspoon of very diluted sodium hypochlorite right on the place where the mold (trich) was. I also put some salt there and a little farther from that area. Green mold progressed 2-3 cm more beyond salt, "ate" a few very small mushrooms and stopped growing at the place where the mushrooms are thicker.
There is now a distinct line where trich stopped and where mushrooms take over. It seems that salt has mostly destroyed trich because now the part where the green devil was isn't as green as it used to be, but more like faded darkened green, and there's no growth of either trich or shrooms there. All in all, trich spread maybe to about one fifth of the total growing area.
The stalk of the shrooms is white, and I can't see any suspicious spots except for one very small blue/green (size of a needle) spot on one small shroom. The caps have brown color that I'd say matches the color I saw on pictures of healthy shrooms that can be found on the Net.
However, almost all shrooms have some totally white, cotton-like, fuzzy stuff between their heads and stalks. I don't know how to describe it... it doesn't really look like spider web, since there are no patterns in it. The best way to describe it is that it looks very similar to the white stuff I found on the surface of fresh Psilocybe Mexicana (Truffles) which were, by the way, delicious. Thank you Sjamaan!
Now, after about 14 days, the largest shrooms are about 6-7 cm tall, and their caps seem to have opened. The caps are much smaller than I expected... the largest one has the cap with a diameter of about 2 cm. Since they opened their caps I wonder are they ready to be harvested or should I wait some more?
I'm asking this because they are still very small when compared to the pics of mushrooms from your site.
I am a total beginner as far as mushroom growing is concerned, so please advise me if they my Stropharia Cubensis are safe to eat. I sure don't want to cause myself any permanent health problems or even die. I read a lot of warnings on various forums about a whole range of mycotixins that can be quite fatal. It made me a little bit scared. I thought about eating only a very small piece (size of a pea) and see if I'll feel sick, and if I don't it means it's safe to consume them.. am I right here?
Overall, the shrooms look pretty much normal (though I'm not an expert on this!), and I'm tempted to try them... but, I would like to hear your expert opinion.
Thanks in advance!
P.S. Unfortunately, I cannot post pictures. If it's a must, I'll try to obtain a webcam.. but it would be difficult.