Query: what are Ferns of Canada
Domain: plants
Relevant documents:
Aspidotis densa
Cystopteris fragilis
Botrychium montanum
Asplenium platyneuron
Dennstaedtia punctilobula
Dryopteris arguta
Cystopteris protrusa
Cystopteris bulbifera
Cystopteris montana
Woodsia obtusa
Dryopteris fragrans
Adiantum pedatum
Woodsia ilvensis
Dryopteris goldieana
Sceptridium oneidense
Cystopteris dickieana