TEICHOMASINE^. CXI. 



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-peUueid, membranaceous, the sterile 

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

 stipitate. Ehizome erect, with stout rigid roots. — The contracted 

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

 tinguish this genus from Triohomcmes, and the free veins from 

 lIt/menostac?M/s. 



Ex. : P. spicata, Fresl. | P. nana, Bory, 



* * Veins retieulated. 



156. HYMENOSTACHYS, Sort/, Diet. Class, viu. 462, 



? t. 69. 



Teichomanis sp., Auet. 



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

 margin of narrower fertile fronds; the reins continued into 

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

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

 shaped, ooaleseent into a simple Uuear 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 sterUe pin- 

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

 lucres sunk side by side along the margins. — A Tery elegant 

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

 several series of oblique elongated areoles. 



Ex. : H. elegans, Freal. 



(b) Involucres two-valued. 



157. HYMBNOPHYLLUM, Smith, Mem. Acad. Tmm, 



V. 418. 



PTTCH0MANE3,-He(fw*^; HtmENO&LOSSUM, Fresl; LEPTOCIONIUM.Pj'esij 

 SPH/EEODIUM, Fresl; MTEttBCOSXIHTM, Fresl ; Ctclogiossom, Pj-es! J 



