[The gravestone is too distant to read in the photo. The memorial page claims the following inscriptions:
Stephen Johnson died Jan. 20, 1857, AE. 78.
Polly White, his wife, died May 18, 1858, AE. 75.
Daniel M. Johnson died Mar. 2, 1822, AE. 5 ys.
Mary Johnson died Nov. 4, 1889, AE. 74.
This appears to suggest Mary never married, but she is not found with her parents in 1850 or 1855 census, or in any census or death record.]