We had this discussion at length in this thread:
I was surprised to see this budding last month with one growth. Finally opened 2 days ago with a very deep black maroon dorsal unlike others in this group I’ve seen. Quite rare now in the market (from poor culture in heat) and almost none existent in the wild (Laos) due to over-collection. A...
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One wonders, if the possibility of the existence of two strains of sulivongii can be excluded: a laotian variety of barbigerum (Schuiteman & Bonnet) and a vietnamese variety of gratrixianum (Averyanov & Gruß)?!