In the same location where we found Dryopteris filix-mas, we also came across a few plants of Polystichum lonchitis, bringing my North America Polystichum count to five (along with P. acrostichoides, P. braunii, P. andersonii, and P. munitum). The leaves are mostly erect, with a distinct arch at the tips (more obvious in the younger, bright green leaves). This species hybridizes with several other Polystichums, and has apparently also been known to form hybrids with Dryopteris goldiana. The offspring of that odd pairing were dubbed genus x Dryostichum by Herb Wagner, with only one species: x D. singulare.
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