Bob, you scare me!
There's only one clone of Doran Black. The most reliable would be that from ISI material. That year's catalog also provided the authoritative description, though I don't have the precise details to hand.
Cultivars can not be propagated from seed unless apomyxis occurs. This has not been reported in the genus Aloe. Even if a hybrid selfs the progeny are genetically different from the parent and so not that cultivar.
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