Here are two references to Oscar Wilde:
  "The Walt Whitman Controversy" - mainly a defense of Whitman's "Leaves
  of Grass", SLC also mentions Oscar Wilde as one of the writers we
  should not judge as obscene without being willing to make the same
  judgement on Shakespeare, Balzac and Fielding.  The piece exists as a
  17 page MS in the MTP and is summarized in Robert Gale's PLOTS AND
  CHARACTERS IN THE WORKS OF MARK TWAIN, page 636.  I believe it is still
  unpublished.

  Oscar Wilde is mentioned by Clara Clemens in her book, MY FATHER MARK
  TWAIN, page 113. Clara says the two men met unexpectedly, seeing each
  other in the hotel dining room in Bad Nauheim, Germany in the summer of
  1892, "...He [Oscar Wilde] and Father became aware of each other at
  almost the same moment and rose to exchange greetings, although as far
  as I know they had never met before.  I cannot remember that Father
  effected an acquaintance between the rest of family and Oscar Wilde,
  but we were grateful that we had eyes with which to stare.  We used
  them well, missing nothing from the gentleman's carnation as large as a
  baby sunflower, to the colored shoes on his feet...".

  Paul Berkowitz