100 



I HI Ol'HIOGLOSSALKS 



in the large forms of B. virginianum and B. st I at folium, forms a large panicle 15 

 centimeters or more in length and hears many hundred sporangia. Two types of 

 leaf division may he noted, a pinnate form represented by B. lunaria and its allies, 

 which are sometimes separated as a special genus Eubotrychium, and a ternate 

 division which is found in all of the larger species. These larger specie s form a 

 second section, Phyllotrichium. A third genus, Osmundopteris, has been proposed to 

 include Botrychium virginianum and its allies. In most of the species of Botrychium 



Fig. 71. 



Ophioglossum simplex 

 Ridley (after Bower). 

 The fertile leaf has no 

 sterile lamina. 



Fig. 72. — (A-D, after Luerssen.) 



A, B. Botrychium simplex Hitchcock. C, B. ternatum Swz. 

 D, B. lunaria (L.) Swz. E, B. virginianum (L.) Swz. 



