246 



HYMENOPHYLLACEAE 



[CH. 



probably correspond to a flattened archegoniophore of Trichovianes (Fig. 5 19). 

 These facts are chiefly interesting as points for comparison with Schisaea, 

 where the gametophyte is also filamentous; but in some respects, such as 

 the archegoniophore, its structure there is even simpler. It must, however, 

 be remembered that the prothalli oi Anemia, Mo/wia, and Lygodium are of 

 the ordinary flattened type. A circumstance which may have its bearing in 



Fig. 517. A — F, Tfichotnanes alaitiin. A, B, show the formation of a flattened piothallus from a 

 filament. C, relation of filaments to the flattened expansions which bear sterigmata distally. 

 D, sterigmata bearing gemmae. E, very young gemmae. F, mature gemmae detached, the lower 

 beginning to germinate. G, result of germination of gemmae of Trichonianes R'aiilfussii. 



various directions is that both in Sdiizaea and in a less degree in TricJio- 

 manes, a fungus is present, and in the former there is a definite mycorhizic 

 relation. The embryo of TricJioinanes has been observed in a relatively 

 advanced state, showing the usual relation of parts, and with a simple 

 spathula-shaped, single-nerved cotyledon (Fig. 516). But the embryogeny 

 has not yet been worked out. 



