This kind of mushroom fruits in cold weather, and these were growing on logs in our wood pile late in December. I took the picture in Green Lane, Pennsylvania, USA, on December 28, 2011, and it was COLD!
They are said to be delicious and are known by other names like enoki. I always caution folks NOT to eat wild mushrooms, however, unless they are expert in mushroom identification or have an expert at hand.
CAUTION AND WARNING: There is a deadly mushroom that fruits at the same time and likes the same habitat; it is called Galerina autumnalis and will cause death if eaten. Here is a web site about this poisonous mushroom:
Here are a couple sites to check if you’re interested in getting more information: