350 CHAEACTEES OF TRIBES AND GENEEA. 



spike, having a line of connate sori on both its margins, 

 and also in the venation being reticulated, being the only 

 instance of such in this extensive family. 



Sp. H. diversifrons, Bory. (v v.). 



A native of Guiana, parts of Tropical America, and 

 Trinidad. 



C. Ring of Sporangia horizontal, apical, in some incomplete 

 or rudimentary only. 



Tribe 26. SCHIZJ3^ (Plate 26). 

 (Schizeacece, Kaulf.} 



Sporangia produced on contracted racemes or panicles, or 

 on marginal lobules or spikelets, oval or oblong, rarely 

 globose, apex striated, annulatiform, opening lengthways, 

 vertical. 



OBS. The oval sporangia, furnished with a striated 

 apex, analogous to a transverse ring, readily distinguishes 

 Schizceacece from the two preceding divisions (A. and B.). 

 They were originally comprehended under Osmundacece, 

 and to judge by the structure of their sporangia, the slight 

 difference scarcely warrants their separation ; but as they 

 differ much in habit, it is deemed most natural to view 

 them as separate tribes. 



In the " Synopsis " sixty species are enumerated, widely 

 dispersed over the Old and New World, extending to New 

 Zealand in the south, and to lat. 40 in the North (New 

 Jersey). With few exceptions the species are contained 

 under the genera Lygodium, Anemia, and Schizcea. 



