Thanks 1flower1world!
Silken, no sheaths usually occur on the second growths that comes up after flowering (these are the second growths of the year). It's the winter growth (Dec-Feb) that should have the sheaths. If no sheaths on these growths I suspect that light isn't enough. Do you grow under lights or window? I would increase amount of light Dec-Feb, more than what you have given.
U Bada, that plant on back right is a Phalaenopsis cornu cervi var flava
... Disguised as a phrag!
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