Donald, I think you can quite safely assume Marbled
Mohr came from an unreduced gamete in William Mohr. The diploid
hybrid has no other fertility. Other than in color it does resemble
its oncocyclus parent, *I. gatesii*, rather a lot.
Austin's "William Mohr, Giant" is another matter,
with behavior significantly different from the authentic William Mohr. Tell was
detailed and scrupulous in record keeping and if he had used Austin's "Giant"
would have specified it in the registration. He did eventually list the
"Giant" (if I remember rightly) in his catalog, but I don't believe he ever
registered any seedlings from it.
Your photo is a delight. Thanks for posting
Neil Mogensen z
7 western NC
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