PTERIDOPHYTES 



163 



%'* 





WtaJa 



Figs ^82-385.— Aspldmm: 382, general habit, showing leaves and circinate verna- 

 tion, dorsiventral (subterranean) stem, and secondary roots; 383. a single pinnule, 

 showing dichotomous veins and sori with shieldlike indusia; 384, section through a 

 sorus showing the indusium and long-stalked sporangia; 385, a single sporangium, 

 showing the incomplete vertical annulus and the transverse dehiscence. — After 



WOSSIDLO. 



