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Abstract
As presently conceived, the genus Physosiphon Lindl. sensu lato is based upon a single character: partial union of the sepals, which brings together a number of very unrelated elements. Connation of the sepals, found in varying degrees in most of the other genera ofthe Pleurothallidinae, fails to circumscribe a definable unit. If constriction of the sepaline tube near the middle were considered an additional criterion, many species currently assumed to belong to Physosiphon would be excluded, leaving only a few species in the genus sensu stricto, but even this combination of characters occurs in other indisputable genera.
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