XLV] 



HYMENOLEPIS 



223 



and fertile regions of the blade is shown in Fig. 731, 35, 36. The protection 

 of the sporangia is very complete, partly by the folded lateral wings, partly 



Fig- 731- ■i\ = Hymenolepis spicata, end of a leaf slightly reduced. 35=ditto, 

 nervation of sterile leaf, slightly enlarged. 36 = nervation of the distal reduced 

 part of the leaf: the position of the coenosorus is shaded. 37 = longitudinal 

 section through a fertile region : x = the vascular strands branching in the fer- 

 tile region : the scales are not represented. 38 = transverse section of a young 

 sporophyll. The sporangia are covered by scales and in-curved leaf-margins: the 

 vascular strands, corresponding to those of the sterile leaf, are black, those 

 peculiar to the fertile region are only outlined. The sclerenchyma is shaded. 

 39 = transverse section below the fertile region. 40, 4i = scales from the sorus, 

 with mucilage-papillae. 42, a, /; = sections of sclerotic nests in the rhizome. 

 43 =z sporangium. (From Von Goebel.) 



