199 



(a) Rhizome elongated, cylindrical, not 

 tuberous ; midrib indistinct. 



(t) No persistent sheaths on the rhizome. 



1. 0. vulgatiim. 



(ii) Persistent brown sheaths on the 

 rhizome. 



2. 0. aitchisoni. 



(b) Rhizome somewhat tuberous, midrib 

 indistinct, plants very minute. 



3. 0. nudicaule. 



(c) Rhizome distinctly tuberous, midrib 

 prominent. 



4. 0. fibrosum. 



i. Ophioglossiim vulgatum L. 



Under this name we have lumped together 

 the hitherto separate species 0. vulgatum 

 L. and 0. reticulation L. as they are merely 

 forms of the same species, being connected by 

 a number cf transitional stages. 



Rhizome cylindrical, elongated ; sterile divi- 

 sion cf trond 1-4 inches long, J-2 inches broad, 

 ovate, ovate-oblong or lanceolate, blunt or 

 acute at the apex, often distinctly cordate at 

 the base, stalked or sessile veins clear, otten 



