Ophioglossum pusillum Raf.  

Family: Ophioglossaceae

northern adderstongue, more...adder's tongue, northern adder's-tongue, southern adderstongue

[Ophioglossum vulgatum var. alaskanum (E.G. Britt.) C. Christens., moreOphioglossum vulgatum var. pseudopodum (Blake) Farw., Ophioglossum vulgatum var. pycnostichum Fern.]