You can get a variety of fern spores through the American Fern Society, www.amerfernsoc.org. I don't know if they have Onoclea offhand, but seems likely.

Patrick Alexander

Try this seedhouse. Gardens north. If I did this right (always questionable) it should take you right to the fern section.
http://gardensnorth.com/site/
It's a Canadian company, though, and Onoclea was not among their offerings. You might ask, though. They might have it, but it eluded their 2006 catalogue.

Hi, I've just started selling fern spore from my site. I only have 4 rare Taiwan tree fern species so far, but hope to have a sizable list of species by the end of the year.
The species I have spore from right now are:
Cyathea fenicis
Cyathea lepifera
Cyathea podophylla
Cyathea spinulosa

We have details and pictures linked from the shop listings from the link below.
Regards,
Phil
Trebrown Nurseries

Here is a link that might be useful: Trebrown nurseries - Tree Fern & other Fern Spore

Just saw this posting. I found spores on ebay...fairly cheap, but shipping charges were high for something so light weight.

I wanted natives, but there were many species available when I bought these last November. We are having our planting workshop this coming week, so I will soon get to see if I wasted my money or not.

This might not be the right season for ferns to sporulate. That might be why you can't find them. I looked at some of my ferns and none have spore capsules on them.