18S OPHIOGLOSSUM 



ADDER'S TONGUE: 



Ophioglossum vulgatum. 



Sterile frond leaf-like^, 2 to 4 inches long, usually 

 elliptic or egg-shaped, rather fleshy, borne near the 

 middle of the common stalk; midvein indistinct or 

 none, the principal veins forming a loose network, 

 the meshes nearly free from secondary veins. The 

 fertile spike bears two rows of sporangia at the 

 top of the stalk; 3 to 10 inches high. Slightly 

 varying forms are occasional. 



Found in wet meadows, but not common, from 

 Canada to Florida, west to Missouri and California. 



NOTES. 



