@gary325
This was identified by our guide as Maxillaria hennisiana.
However looking at the foto's on orchidspecies.com, I'm afraid this might be a misnomer.
Would this not be Maxillaria weberbaueri?
It's hard to see on the enclosed pictures, but if I enlarge even more I see on my desktop also some purple on the side lobes.
These plants are all rather yellowish, but I have another observation in the same immediate area with relatively white petals and sepals and which problaby pertains to the same species.
This observation can be found under www.inaturalist.org/observations/146702919