179 



Veins reticulated and wholly covered by 

 sporangia, the sori being in fact reticulated. 

 Fronds either simple, pinnatifid or pinnate. 



FIG. 42. Vittaria elongate Sw. 

 (a) Complete plant ( x J ). 



(6) Vertical section through frond showing the position 

 of the sori (much magnified). 



