You can read my full post
here, but here is an excerpt:
"To deal with the name dilemma for man-made or man-selected plants, the terms group and cultivar were introduced. As I mentioned earlier, since there are no botanically recognized varieties or forms of Neofinetia falcata, the term cultivar is more appropriate for identifying 'Tamakongo' place in the name of Neofinetia falcata.
"A cultivar is an assemblage of plants that (a) has been selected for a particular character or combination of characters, (b) is distinct, uniform and stable in those characters, and (c) when propagated by appropriate means, retains those characters." - Cultivated Plant Code. Art. 2.2 Brickell 2009, p. 6
According to Hortax (Cultivated Plant Taxonomy Group), the cultivar name should be enclosed in single quotation marks with the first letter of each word capitalized. Unlike the scientific botanical name, the cultivar name is never written in italics. Thus, the correct horticultural name is Neofinetia falcata 'Tamakongo'. If a group of cultivars exists, the words in the group name have the first letter capitalized and the group name is placed in parentheses if used together with the cultivar's name. Neofinetia falcata 'Tamakongo' belongs to Mameba or Bean-leaf group, therefore its full horticultural name would be:
Neofinetia falcata (Mameba Group) 'Tamakongo'
or
Neofinetia falcata (Bean-leaf Group) 'Tamakongo'
Although, a simplified name like Neofinetia falcata 'Tamakongo' is acceptable and it could be optional to include the group's name."
As far as 'Setzuzan' name goes, I would use
Neofinetia falcata (Torafu Group) 'Setzuzan'
or simplified Neofinetia falcata 'Setzuzan' and consider it a cultivar. I don't know if this is a botanical variety or not, someone has to do a study and confirm its botanical status. Most likely it is not a botanical variety, as we don't know if there is a viable wild population exists or excited. "Samurai" could have been spotted and selected a single mutation. In addition, some cultivars known to "come true from seed" .
I don't invent new names, but use existing convention. The most confusion with Neofinetia naming comes from misunderstanding the term VARIETY. In my understanding they are CULTIVARS and should be treated as such.