This plant hair consists of three distinct cells. The base cell is the smallest and is isotropic.
The next cell is elongated and birefringent. The final cell is also birefringent and terminates
in a sharp point.
Transmitted Off Crossed Polarized Light Illumination
Significance in the Environment:
Uphof, J.C. Th., Karl Hummel, and Karin Staesche, PLANT HAIRS, Gebruder Borntraeger, Berlin, 1962.