"The mushrooms are ready to pick about the time the veil breaks. ...In picking the mushrooms the best way is to take hold of the plant by the cap. By moving the hand from side to side with a slight circular motion the stem is freed from the soil. ...After picking the mushrooms, wherever the stems have made a little hole in removing them from the earth, a little soil should be added to cover this up again."
January 1, 1970
https://en.wikiquote.org/wiki/Fungiculture