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Alan, a bit of a rabbit trail, but your mention of Dr. Ronald Mackenzie brought to mind a question. Do you or any other colleagues here know what supplier or specialist is propagating the yellow drop with his namesake, G.'Ronald Mackenzie'?
I don't begrudge him a quieter retirement, it must be quite a hassle, merely expressing surprise. I've had some nice snowdrops from him over the years.
Secondly the one with the bold splash of green on the outer segments appearing at the 1.00 minute point and again at 2.58 mark.George