Fic. 141. — A, B, Boirychium simplex, slightly enlarged; C, B. ternatum, X %> ^f 1^^^ 

 segment of B. lunaria; E, leaf segment of B. Virginianum, natural size; F, portion 

 of sterile leaf segment of Helminthostachys Zeylanica; G, fragment of the sporan- 

 giophore of the same enlarged. A, B, C after Luerssen; D, F after Hooker. 



