Is one allowed to pick mushrooms from where they grew on shabbos?
To provide some context:
The Talmud (Berachos 40b) states that although mushrooms grow on the ground, the proper Beracha is nonetheless Shehakol, the general Beracha for foods that are not plants. The Talmud explains that although mushrooms do indeed grow on the ground, they are exceptional in that they do not derive their primary nutrition from the soil, as do other plants. [Interestingly, the Aruch Hashulchan (204:5), among others, holds that if one made a mistake and recited HoAdama on mushrooms, it would be acceptable, since the Talmud does consider mushrooms to be Gidulei Karka (growths of the ground), although they do not derive their sustenance from it.]