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Dear Stan
Acriflavin or acridine orange will stain pollen walls with green fluorescence.
Regards
Dr Lloyd Donaldson - Microscopist
Cellwall Biotechnology Centre
SCION - Next generation biomaterials
Te Papa Tipu Innovation Park, 49 Sala Street
Private Bag 3020, ROTORUA, New Zealand
DDI 64 7 343 5581
Fax 64 7 343 5507
email [hidden email]
http://www.scionresearch.com/fluorescence+microscopy+of+wood.aspx