— 219 ― 



more according to their position. They stand at the し eginning in an 

 open communication with the steni ； but more afterward, the wiaer 

 opening is pradually narrowed by thickenino- of wall a r round it, leav- 

 ing a narrow central aperture which becomes frequently closed by 

 subsequent thickening*. 



The pedicel of fertile leaves has a slight protuberance at the inner 

 side which Cramer has described as " Buckd." It recalls the corona 

 superior of Acetabuhv'ia, On the apex of the protuberance, there is 

 ia 2-3 times polychotomous hair (lig, 1 2 ； i.e. the '* lio-ulare Inaar o 

 Cramer) ； but not seldom it remains in the form of a simple, cylindrico- 

 attenuatecl cell. The hair, which is much shorter and slenderer than 

 the sterile leaves, is soon dropped oft; so that the apex of the pro- 

 tuberance is truncated in older ones, leaving a minute pore. At the 

 outerside of the protuberance, that is the side away from the stem 

 and therefore facinp- toward the scimiter like body, there is another 

 smaller sinc^le cell. The latter, which Cramer has described as 

 " brinformige. Anlao-e/* is mostly only one, but not seldom two are 

 present, and in other times, entirely wanting. The nature of this cell, 

 as Cramer has supposed, may be considered as a lateral rudimentary 

 hair. 



All the segments of the fertile leaves, i.e. the pedicelate portion, 

 hairs etc. are at first in free communicatloa with stem, but the pore is 

 oJten closed by subsequent thic に eninp". The fertile leaves and the 

 stem are thickly calcitied, while the sterile leaves and so called 

 '( ligular Haar " of the fertile one are not. 



The fertile leaves when mature are transformed into sporangia, 

 each oi which contains 23-36 aplanospores. The spore is spherical, 

 covercid with two membranes ； the outer thin and structureless ； the 

 inner tiiick and radially striated in optical section. Spores measure 

 140-207 II in diam. and the inner membrane is 12-22 ド thick. On 



