Ix. GENERA. OF TEENS : 



equally anastomosed, i.e., the lines more or less but sparingly 

 uniting, sometimes only at the ends ; the receptacles thus reticu- 

 lated. Veins simple or forked from a central costa, parallel 

 below forming elongate oblique areoles, more closely reticulated 

 near the margin forming one or two series of shorter areoles, the 

 ultimate veinlets sometimes free. 



Fronds simple or pinnate, sub-membranaceous. Ehizome short 

 erect, or creeping. This group is nearly the equivalent among 

 the Hemionitidea, of Olfersia among the Acrosticheoi, but is 

 more distinctly areolate towards the margin. 



Ex. : S. alismsefolium, J. Sm. I S. vittaeformis, J. Sm. 



S. vestita (Grammitis, Wall.) \ S. pinnata, J. Sm. 



(e) Primary veins arcuate, forming costal areoles ; venules 

 reticulated, the marginal free. 



83. DICTYOGRAMMA, Fee, Gen. Fil. 171, 1. 15 A. f. 2. 



NOTOGBAMMA, Preil (MS. Corrig. in Epim.J; GYMNOGBAMMATIS sp., 

 Auct. ; HBMIONIIIDIS sp., Auct. 



Sori non-indusiate, superficial, narrow-linear, sub-parallel, 

 sparingly anastomosing ; the receptacles thus reticulated. Veins 

 arcuate, forming sub-elongated areoles parallel with the costa ; 

 the venules anastomosing in about one series of oblong oblique 

 areoles with the marginal veinlets simple or forked, free and cla- 

 vate at their apices ; or more uniformly reticulated in several 

 series of oblique oblong hexagonal unequal areoles. 



Fronds pinnate or sub-pinnate, sub-coriaceous. Rhizome 

 short decumbent, in D. elongata creeping. This genus in its 

 typical species, D. japonica, differs from Syngramma, in having 

 a series of areoles parallel with the costa, and free marginal 

 oblique clavate veinlets. The Semionitis elongata of Mr. Brack- 

 enridge, is too nearly allied in structure to be separated from 

 D. japonica, though it differs somewhat in its more frequent 

 reticulations, and judging from the figures, for both plants 

 are unknown to us, in the nearly always free forked and inter- 

 rupted hardly reticulated sori. The sori, in both, are frequently 

 forked and free at the upper ends. 

 Ex. : D. japonica, Fee. \ D. elongata (Hemionitis, BrackenrJ 



