68 



OPHIOGLOSSACEAE 



[CH. 



Fig. 364. A, Ophioglossum palmatiiui L., a single fertile spike with sporangia still closed; B, part 

 of the same with sporangia ruptured; C, Botrychiuni Lunaria Sw. , a fertile spike; D, a branch 

 of the same with ruptured sporangia, seen from within; E, the same seen from without; 

 F, Helniinthosiachys zeylanica Hook., sterile and fertile regions of the leaf; G, branch of the latter 

 with a group of sporangia, and at the apex the irregular terminals of the sporangiophore. 

 {A, B, C, E, after Bitter, in Engler and Prantl ; D, after Luerssen ; F, G, after Hooker.) 



Fig. 365. Ophioglossum vulgatiim L. A, median radial section through a very young spike showing 

 an initial cell (x) ; B, similar section of an older spike; 6", transverse section of a leaf, as along a 

 line (/;-) in A, traversing a young spike, O. reticiilatum L. ; D, tangential section of leaf (/) 

 traversing a young fertile spike; F, G, transverse sections from the apex of a young spike of 

 O. vulgatum, showing four initials (x). ( x 100.) 



