If it's just ferns your after, I don't think that would be hurting anything. Not like your taking out dogwoods are anything like that.. Don't quote me on this though.
As for collecting them, you could just moisten paper towels well and wrap the roots up with them, put them in small dixie cups/or whatever. just keep some roots on them. I've had plants sit outside for week or so till I got a spot ready for planting, just keepem moist. Good luck
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Jeff 
Looks like a Telefunken U47
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