PTEUIDOPHYTA. 



707 



Fi" 400.— Various Ferna. 



concealed by a tuft of scales, below they ^^l^'^l''^^^^ \, Sporangium of Polypodium. n Sporangium of ScAu«a. 

 section of a sorus of Cyathea. » Sporangmm of Cyathea. ^ ^ „ ^ ^..^ize ; ». ». >«. u. i., », ». >». •• x 6-20. 

 i« Under side of the prothallium of ^spi«»»»"i- 



