Yes I can't vouch for the authenticity of the tranlineanum discovery. I'd post a link to the paper, but except for the title the rest is in Chinese. Maybe someone out there can translate and see if it makes sense.
Ive tried to find the full text without luck. I'm not willing to hand my credit card details over to an unknown Chinese website, so I'll have to wait until I find a copy elsewhere.
But what would delineate an authentic find versus fraud? A photo of a GPS digital readout in the middle of a 100 plant colony?
Possibly but not necessarily. I guess it would depend on the credibility/motivation of the author and how likely the information is correct ie secondary sources.
I think its possible that some of the species you mentioned can be found naturally in China but I'm not convinced.
A number of species have been described based on plants that had been found in nurseries but it the race to publish first and a lack of information about location of habitat, general habitat or false habitat information has been provided.
If you search for hangianum on the net you'll find a few pages that state that hangianum can be found in Vietnam/China but some of these are dead ends because they provide no references. Other sites provide references but those references leave me with some doubt. Examples below:
The botanists introduced me to a local orchid grower who had mainly cymbidiums in his backyard, but also a few paphiopedilums, including P. hangianum. I suggested that these plants most likely would have their origin in nearby Vietnam, but the orchid grower emphatically confirmed that a friend from Malipo had collected these plants near Malipo in Yunnan. Though doubts remain
,I am inclined to believe that statement.
Perner, H. "The Moon Slipper - Paphiopedilum hangianum." 2006
L. Averyanov wrote the following:
Distribution. Vietnam (Bac Kan, Tuyen Quang). Endemic.
Studied specimens. Bac Kan, Cho Don, HAL 4789 (HN), HLF 806 (HN, LE);
Tuyen Quang, Na Hang, HAL 126 (HN, LE), HAL 192 (HN, LE).
Notes. Local endemic with very restricted distribution. There are few doubts that description of P. singchii reported from southern Yunnan is based on plants imported from Vietnam.
Turczaninowia 2008, 11(1) : 5–168
In the description of Paph singchii (hangianum) Z.J. Liu et J.Y. Zhang wrote:
“singchii is described based on two flowering plants cultivated in the Shenzhen City Nurseries. It was said the plants were collected from Southern Yunnan”
P. singchii Z.J. Liu et J.Y. Zhang, 2001, Acta Phytotax. Sin.38, 5: 468.