PTERIDOPHYTA. 



707 



Fig. 400. Various Ferns. 



i Nephrolepis Duffl. 2 Trichomanes Lyallii. Sorus of the same fern, with cup-shaped investment seen in longitudinal 

 section. * Rhipidopteris peltata. 8 Polypodium serpens. 6 Portion of frond of Gleichenia alpina. 1 Schizcea fistulosa. 

 Botrychium lanceolatum. Under side of a fragment of the frond of Gleichenia alpina ; above the sporangia are 

 concealed by a tuft of scales, below they are exposed. " an d " Fertile pinnule of Cyathea elegans. " Longitudinal 

 section of a sorus of Cyathea. " Sporangium of Cyathea. 1* Sporangium of Polypodium. is Sporangium of Schizcea. 

 " Under side of the prothallium of Asplenium. 1, 2, 4, 6, e, i t 8 natural size ; 8, 9. 10, 11, 12, is, 14, u t ie x 5-20. 



