Shawn,
To be honest, I'm not really sure where these contaminants came from. There are no 'wild ferns' near my growing area and I've quietly yanked off those I found at my neighbour's area (ssshhh...

).
Spores were harvested directly from the
ridleyi 'cup', which was loosely covered with a plastic bag (as it was turning brown) to catch all the spores, lest I overlooked their release (and ya, these are dropped in huge clumps!)
I'm sending a sachet of
ridleyi spores to a member here. Likewise, a SG member is trying to OD me on
elephantotis spores! Looks like fun times ahead!
Regards,
Ronnie