TBICHOMANINE.E. CXU 



mouth. Veins (sterile) simple or forked, from a central costa ; 

 the venules free ; those of the fertile fronds simple, very short, 

 pedicelliform. 



Fronds dissimilar, sub-pellucid, membranaceous, the sterile 

 pinnatifid or pinnate; the fertile reduced to the rachis, long- 

 stipitate. Rhizome erect, with stout rigid roots. The contracted 

 rachiform fertile fronds, quite dissimilar to the barren ones, dis- 

 tinguish this genus from Trichomanes, and the free veins from 

 Stfmenostachys. 



Kx. : F. spicata, Pregl. \ F. nana, Sory. 



** Veins reticulated. 

 156. HYMENOSTACHYS, Sory, Diet. Clots, viii. 462, 



TRICHOMANIS sp., Auct. 



Sori involucrate, seated in extrorse -marginal cysts, sunk in the 

 margin of narrower fertile fronds ; the veins continued into 

 filiform exserted receptacles, which are free within the cysts, and 

 bear sessile lenticular spore-cases at their base. Involucres bell- 

 shaped, coalescent into a simple linear fertile frond, the mouth 

 truncate entire. Veins (sterile) forked from a central costa; 

 venules and veinlets anastomosing, forming elongated hexa- 

 gonal areoles; (fertile) simple or forked, free. 



Fronds dissimilar, pellucid membranaceous; the sterile pin- 

 natifid or pinnate ; the fertile narrow linear-elongated ; the to- 

 lucres sunk side by side along the margins. A very elegant 

 genus, in which the veins of the sterile fronds anastomose in 

 several series of oblique elongated areoles. 



Ex.: H. elcgans, Pretl. 



(b) Involucres two-valved. 



157. HYMENOPHYLLUM, Smith, Mem. Acad. Turin, 

 v. 418. 



PTYCHOMANES, Hedwig; HTMESOQIOSSUM, Presl; LBPTOcioyiof,Pre/; 

 SPH.BBODIUM, Pretl ; MYEMBCOSIYLUM, Pretl ; CYCLOGLOSSUH, Pretl ^ 



