Need expert advice on a mixed orchid bag...

[Mahon]

Sounds like you have the correct conditions stated for those Dracula, just need to find a way to grow them The terrarium will most likely smother them if it's bright and hot.

As for the Masdevallia hybrid, it probably should be grown in slightly shadier conditions (perhaps along with those Dracula).

Apoda-prorepentia dodsonii (basionym: Pleurothallis dodsonii) is a neat little species discovered by Dodson near the Río Blanco in Baños, Ecuador (Pastaza province) at 1,600m elevation in Oct. 8th, 1961. Luer described it as a new species in 1976in honor of Dodson... anyways, this should be grown shadier, damper and quite cooler. This one will have a vining and branching habit, so it may be difficult to grow with alternative growing methods (like the Dracula experiment of mine)...

That Vuylstekeara (multigeneric Oncidiinae hybrid) should be the easiest of the lot...

Good luck!
-Pat