PTEllIDOPHYTA. 



707 



Fig. 400.— Various Fern 



1 Ncphrolepis Duß. 2 Trichomanes Lyallii. 3 Sorus of the same fern, with cup-shaped investment seen in longitudinal 

 section. '^ lihipidopteris peltata. ^ Polypodium serpens. « Portion of frond of Gleichenia alpina. '' Schiztea Jishdosa. 

 ^ Botrychium lanceolatum. 9 Under side of a fragment of the frond of Gleichenia alpina; ahove the sporangia are 

 concealed by a tuft of scales, below they are exposed, lo and n Fertile pinnule of Cyathea elegans. 12 Longitudinal 

 section of a sorus of Cyathea. 13 Sporangium of Cyathea. 1* Sporangium of Polypodiiiin. is Sporangium of Schizcea. 

 16 Under side of the prothallium of Aspleniwn. 1, 2, f s, «, ?, 8 natural size ; 3, '^. i<\ 11, 12, is, 14, is, 16 x 5-20. 



