Bulletin of the Torrey Botanical Club Plate 318 - Ophioglossum arenarium E. G. Britton
<a href="//commons.wikimedia.org/wiki/Elizabeth_Gertrude_Knight_Britton" title="Elizabeth Gertrude Knight Britton">Elizabeth Gertrude Knight Britton</a>
1897-12-30
Bulletin of the Torrey Botanical Club, Volume 24 (1897) Plate 318