Dig deeper at SERNEC, a consortium of southeastern herbaria.
Monilophytes (ferns): Ophioglossoid Ferns (eusporangiate ferns): Ophioglossales
Engelmann's Adder's-tongue, Limestone Adder's-tongue
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Richard and Teresa Ware rtw_o_engelmannii_3
The veins of sterile blades form 2 sets of areoles: fine bounded by coarse, per Field Guide to the Ferns and Other Pteridophytes of Georgia.
COMPARE Adder's Mouth and Adder's Tongue