350 CHAKACTEES OP TRIBES AND GEXEEA. 



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. Sing of Sporangia liorizontal, apical, in some incomplete 

 or rudimentary only. 



Triho '26.—SCB.lZJE^ (Plate 26). 

 {Schixeacea;, 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. 



Oes. — The oval sjjorangia, furnished with a striated 

 apex, analogous to a transverse ring, readily distinguishes 

 Scliizceacea^ fi-om the two preceding divisions (A. and B.). 

 They were originally comprehended under OsmundacecE, 

 and to judge by the structure of theii' 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 Scliiz'Xa. 



