Hi, in the meantime I have retrieved the following information in a Latin-American forum:
dodsoniana: lip very open and wide (in comparison to the othe species), and longer than in the two other species
russelliana and thylaciochila: Lip pretty closed, almost like a bag, however the tip of the lip in russelliana is reflexed like the lip of Clowesia warscewiczii.
There is a lot of variation in color, fragrance, distribution and blooming season in all species, so that these characters are not good for identification.
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