V. coerulescens is a completely different species to
V. coerulea.
V. coerulea is a larger plant than
V. coerulescens vegetatively and florally speaking.
Each flower on a
V. coerulea is roughly about 2" across.
Each flower on a
V. coerulescens is roughly about 3/4" across.
Each leaf on
V. coerulea is just overall larger than
V. coerulescens.
There are other slightly noticeable, but smaller differences between the 2 species.
If I'm not mistaken
V. coerulescens can handle cooler temperatures than
V. coerulea can.
Vanda coerulea:
IOSPE PHOTOS
Vanda coerulescens:
IOSPE PHOTOS