Another explanation is that picking pine mushrooms symbolizes finding a goal in life. We need not only to know what we want, but also to pursue it. Picking up matsutake in your dream may be a subconscious reminder that you need to explore your own life path bravely.
Tricholoma matsutake is usually considered as a very precious food. If you pick up a lot of pine mushrooms in your dream, it may be a hint that you are about to reap success and wealth. At this time, you need to continue to work hard and remain modest in order to realize your dreams.