Dryopteris ×neowherryi is a hybrid between D. goldiana and D. marginalis.
Huperzia lucidula

Dryopteris ×neowherryi is a hybrid between D. goldiana and D. marginalis.
Llavea is a genus of the Pteridaceae with a single species, L. cordifolia. It is locally common on slopes and ledges in oak-pine forests in the mountains of Oaxaca. It ranges throughout Mexico, and has been collected in Guatemala and Costa Rica as well. [gallery...
Very nice – the medial position of the sori is killer for this hybrid.
Is this the plant from Duffy’s Swamp?
No, this is the plant that Art Gilman showed us.
Beautiful hybrid! Very rare in nature, I presume. By the way, do you know if David still has copies of “Henry Potter’s field guide to the hybrid ferns of NE”? I would like to buy one…
They are available from the Tryon Pteridophyte Library http://www.uvm.edu/~plantbio/pringle/Libraries.html
Thanks for the link! I will buy it tonight. That website is amazing, btw… I loved that photo of the Tryons in their early days. I also enjoyed reading about Cyrus Pringle (what a beard!) and the profiles of important collections at VT.