They don't really have aerial roots unless humidity is super high. Well some of paph and phrags started growing roots outside the the pot since they were right next to the humidifier with a fogger.
Perhaps it was the misting that stimulated some roots that high on the plant
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Fren
Orchidacea are the largest and most diverse of the Angiospermae, and includes 800 genera and 30 000 species
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