It's been a while since I've researched this suybject so I've searched for some helpful information for you, Janie. Here are some helpful links:
forums.gardenweb.com/forums/load/.../msg0314571725708.html

http://bryophytes.science.oregonstate.edu/page32.htm

Brooklin Botanic Garden

Your plan sounds marvelous. Keep us posted, will you?

maeve