Leonard — Genus TaeniMs, with Notes on remaining Taenitidinae. 267 



marginal, while between it and the midrib is a reticulum, in which intra- 

 areolar blind-endings are found. In this respect it compares generally with 

 the sterile leaf of Drymoglosswm; bat in. this genus the commissure of the 

 fertile leaf is not marginal. The question may then arise on this point, 

 whether the relationship of Paltonium may not be with the Pterid series 



Fig. 10. — Paltonium lanceolatum. 

 Sporangia. 



Fig. 11. — Paltonium lanceolatam, 

 Venation of fertile leaf. 



where the fusion sorus is actually marginal. Doubtless this may have been 

 the reason for the name Heteroptcris assigned to this fern by Fee. 



This possible alternative must for the present be left open, till the 

 structural details are available from more extensive material than that at 

 present in hand. 



Hymenolepis. 



Hymenolepis was first described by Kaulfuss in 1824. Like Drymo- 

 glossum and Paltonium it has also been included by some authors in Taenitis. 

 It differs in habit from these in having a short, creeping rhizome, and in its 

 leaves being more closely packed together ((5), fig. 161). The leaves are 

 simple, broader than those of Paltonium, and are thick and fleshy in relation 

 to its epiphytic habit. Dichotomy of the tip of the leaf was observed in one 

 instance. The sorus is continuous, and is situated intra-marginally on the 

 leaf, and is devoid of indusium. Material of the epiphytic species H. spicata 

 was available for examination, collected from tree-tops in Queensland by 

 Professor Osborn, of Adelaide, South Australia. 



