A delicate fern of woods and damp places in the uplands of northern Eurasia and North America.
- Genus Gymnocarpium (formerly Thelypteris), family Woodsiaceae: two species, in particular G. dryopteris
- Aquarius Research Natural Area is particularly rich in ferns, including Western polypody, spreading woodfern, oak fern, male fern, bracken fern, and sword fern.
- Here we have concentrated on growing ferns, ranging from the large and leathery Blechnum chilense, to the small and frothy oak fern, Gymnocarpium dryopteris.
- As well as being a home to wildlife, it also has pockets of enchanted nightshade, yellow pimpernel and oak fern.
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