Abstract: A headstone assembly for a lawn crypt has a headstone holder with a cavity of rectangular cross-section shaped and dimensioned to receive the lower end of a headstone, a headstone with a lower end portion for engagement in the cavity and an upper end portion projecting upwardly out of the cavity, and a separate headstone base member or collar with a flat lower surface for engaging the ground above a buried lawn crypt and a rectangular opening of predetermined dimensions for engaging over the headstone. After an interment, the opening in the base member can be engaged over the headstone, and the base member can slide down over the headstone until the lower surface of the base member engages the ground to form a flat base member surrounding the base of the headstone, providing an additional surface for informational or ornamental indicia and for supporting containers such as flower vases.