OPHIOGLOSSACE^.. 161 



OPHIOGLOSSACE^, 



A SINGULAR class of Fems, having sub-globose sporangia, 

 which are sessile, unilocular, and opening by a vertical or 

 transverse slit, and being bivalved. 



Fronds solitary, bearing a fertile and sterile branch on the 

 same stem. 



There are two divisions, namely, Ophioglossum and Botrychium. 



VOL. vn. 



