Referencing Stapledon Or Tolkien

Poul Anderson does not often refer to other authors in his fiction, certainly not by name. There is an understated reference to HG Wells, not by name, in There Will Be Time. Arthur Conan Doyle's most famous character is mentioned several times, and even appears once, but not Doyle himself. When Anderson says that "...we can only hope for another Stapledon...," (see here) this is in a work of non-fiction.

Two other sf authors do explicitly refer to Stapledon:

"The notion of modifying the human stock genetically to live on the planets as they were found, had been old with Olaf Stapledon; it had been touched upon by many later writers; it went back, in essence, as far as Proteus, and as deep into the human mind as the werewolf, the vampire, the fairy changeling, the transmigrated soul."
-James Blish, The Seedling Stars (London, 1972), Book One, 3, p. 50.

Blish covers a lot of territory, going way beyond his immediate theme of "pantropy," artificial adaptation of human beings to other planets. He mentions:

Stapledon;
later writers;
Proteus;
werewolves;
vampires;
changelings;
transmigration.

Which of these additional themes does Anderson address and in which works?

Early in the opening volume of her future history about psychic powers, Julian May summarizes the plot of Stapledon's Odd John when young Rogi, trying to understand his own ESP, reads that novel. That is one way to do it. May's Galactic Milieu and Anderson's Genesis are two successors of Stapledon's future history but one difference is that Genesis does not say so.

In SM Stirling's Emberverse alternative future history, some characters base themselves directly on Tolkien's Middle Earth, even speaking Elvish. Literature resembles one long series whether or not later texts explicitly acknowledge earlier ones.