Arum pollen germination

Dear Fellow Aroidophyles,

I tried to make some pollen germination experiments on Arum italicum.
I used the Brewbaker-Kwack medium with the pollen floating (in water or 
in the same medium without agar). The germination rates observed varied
from 18-30% and were the same whatever was the liquid medium, as long as it
didn't dry.
Are these rates "normal" for Arum? Do you use another method?

Thank you in advance for your help,

Sincerely yours,

Marc Gibernau
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