100 



THE OPHIOGLOSSALES 



in the large forms of B. virginianum and B. silaifolium, forms a large panicle 15 

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

 leaf division may be noted, a pinnate form represented by 5. lunarta and its allies, 

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

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

 second section, Phyllotrichium. A third genus, Osmundopterisyhzs been proposed to 

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



Fio. 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. lernatum Swz. 

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



