Although stomatal opening in Tillandsia usneoides is not detectable by light microscopy, the guard cells
swell in the dark and in the light in buffers known to stimulate stomatal opening. Abscisic acid or phenylmercuric
acetate substantially reduced subsequent nocturnal C 0 2 uptake. Potassium ions were more concentrated
in the guard cells in the dark than in the light. The stomata of this CAM epiphyte appear functional: open
at night and closed throughout most of the day.
This is the publisher's version, also available electronically from: http://www.jstor.org/stable/10.2307/2474260.
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