Symplocarpus foetidus (closer to bulbous than cardamine)
Jim McKenney (Sun, 07 Apr 2013 15:22:06 PDT)

Ellen asked "Do you, or does anyone, know whether freshly ripened seed can be stored in
damp sphagnum moss?" 

Ellen, here's what Harry R.. Phillips  said back in 1985 "Plant immediately. Stored dry, the seed coats dehydrate and the embryos shrivel; stratified, the seeds break down into a watery mass."

Phillips' book, Growing and Propagating Wild Flowers, is one I have used for decades and it has never disappointed. 

If someone has since figured out a trick to store this one, I'm not aware of it. 

Jim McKenney