This being Bloom, and I being an unabashed Tolkienist, I checked the index to see if there were any references to JRRT, and found only one, in his essay on Dante of all places:
. . . for a neo-Christian poet like T. S. Eliot, the Comedy
becomes another Scripture, a Newer Testament that
supplements the canonical Christian Bible. Charles Williams
-- a guru for such neo-Christians as Eliot, C. S. Lewis, W. H.
Auden, Dorothy L Sayers, J. R. R. Tolkien, and others --
went so far as to affirm that the Athanasian creed . . .
did not receive full expression until Dante. The Church
had to wait for Dante . . . Williams highlights throughout
his intense study The Figure of Beatrice . . .
the great scandal of Dante's achievement . . . (p.73)
Of course it's inaccurate to say that either Eliot or Tolkien, both of whom liked Wms personally, were ever under his spell. But that correction overlooks the point: for Bloom, a passing casual reference in a thick book with recommended/approved reading lists that run a full forty pages has the effect, I suspect intentionally, of marginalizing Tolkien. In Bloom's view, as expressed elsewhere (ironically, in his introduction to collections of essays about Tolkien's work that list Bloom himself as editor), Tolkien studies are a bizarre and peripheral phenomenon. It's as if fans of Barbara Cartland and Louis L'Amour were fighting to have them taught in university English courses alongside Orwell and Hemingway. Thus he's taken up the mantle of Edmund Wilson in this regard, to sort the wheat (his approved authors) for the chaff (everything else).
So, who does make the cut as literary among authors and works generally considered science fiction and fantasy (that is, claimed by science fiction and fantasy readers as one of their own)? In a quick skim through the extensive listings of Canonical works provided in Bloom's Appendix, I spotted relatively few, including Wells ("THE SCIENCE FICTION NOVELS"), A VOYAGE TO ARCTURUS,** RIDDLEY WALKER, THE THIRD POLICEMAN, The GORMENGHAST Trilogy, THE LEFT HAND OF DARKNESS, LITTLE, BIG, and a few others. No Bradbury, no Zelazny, no Dunsany, no Tolkien. I'd say there's something wrong with a standard that includes PUCK OF POOK'S HILL but cannot find room for THE LORD OF THE RINGS.
Of course, this book came before the big breakthrough of the "Book of the Century" polls. I'm curious what the next generation's version of this sort of book, whoever it's by, includes as 'canonical'
*see, for example, his argument in his Preface that the best parts of GENESIS and EXODUS and NUMBERS were written by King Solomon's mother.
**Bloom has been a great admirer of Lindsay's for years, having gone so far as to write his own version of ARCTURUS called THE FLIGHT TO LUCIFER .