Tiara' was indeed part of a tissue culture batch. It is a highly unstable
cultivar producing a very large percentage of sports. It probably is
the most prolific yet. Four of its sports are already registered, and I have
another as does Carol Brashear. In addition to these periclinal forms, it
produces a remarkable number of sectorials and mericlinals. I would guess that
one division out of five will have a sport in it. The other two plants I saw
twinspots in were not tissue cultured.
discussion moves on, we should address the other type of sport which in your
third article in the AHS Journal you say is caused by mitotic recombination.
This would be blue plants sporting to green. In another article, you state that
a blue/green chimera is impossible, so we will stick to complete changes. Your
example here is the group of all-green sports said to have come from
'Halcyon'. You state clearly that each is different from the other. I must
remind you that little is actually known about the origin of these plants not
even where they sported. Do you have information on the origins of these plants
you could share with us? Because you chose them as examples for your "Rule
of Thumb" I assume you must. Please fill us in. If blue plants do actually sport
to green forms, why would this be mitotic recombination and not a nuclear
mutation affecting the gene that controls the wax
record, I should say that I have never seen a blue plant produce an all-green
division. Has anyone else among those reading these posts?