Leonard — Genus Taenitis, with Notes on remaining Taenitidinae. 269 



them. A perforation is seen closing in (2), but the meristeles have again 

 separated in (3). The leaf-trace consists of two straps, which, taking a 

 course for some distance along the stem after entry, appear to increase the 

 number of meristeles present to seven (4) ; but later they fuse with the 

 others, so that finally the original five meristeles are established once more. 



The leaf-trace is of the same character as those of the last two genera, in 

 consisting of two straps, which fuse into one in the course of the petiole. 



The Sorus. 



The leaf is linear and about an inch to an inch and a half at its widest 

 point. The sorus is also linear and devoid of an indusium. It may extend 

 down the whole length of the leaf, or it may be confined to the distal end. 

 Sometimes at the tip of the leaf, in the mature state, the sorus may spread 



Fio. 14. — Hymenolepis spicata. 

 (a) and (4) Stellate hairs from sorus. (c) Sporangium. 



inwards, and even give the appearance of meeting at the midrib, thus 

 suggesting an aerostichoid state. 



There are numerous paraphyses among the sporangia which consist of a 

 stalk bearing from three to a large number of spreading hairs on its tip. 

 (Fig. 14a and b.) 



The sporangia are large with eighteen indurated cells in the annulus. 

 (Fig. 14 c.) The annulus is vertical, and there is a very long three-celled 

 stalk. The spores are two-sided. 



Venation. 

 It was difficult to demonstrate the venation of H. spicata owing to the 

 fleshiness of its leaves. But in Engler and Prantl (fig. 161) the venation is 



