OSMNOaEAMME*. IxV. 



(in base of eegments) anastomosing and forming elongated ob- 

 lique blunt costal areoles, from which free clavate venules extend 

 to the margin ; the areoles along the primary costa longer and 

 more evenly arcuate ; upper (apical) veins simple or forked, free, 

 clavate ; veins of the fertile fronds anastomosing only along the 

 primary costa, the rest simple or forked, free. 



Fronds herbaceous, pinnato-pinuatifid, the segments of the 



fertile fronds narrower. Ehizome ? — There can be no 



doubt, from Presl's figurfe and description, that this is the plant 

 he intended to call Digrammaria, but all bis synonymes are 

 erroneous. The name is highly applicable to it, for its linear 

 sori, borne on the two branches of the forked veins, look like 

 double lines of spore-cases united below. We cannot agree with 

 those who unite this plant with iStenosemia, which has a truly 

 acrostichoid structure, 



Ex. : D. ambigrua, Fresl (Helerogordum aapidioides, JPresl.) 



(d) Veins imiform reticulated, with free included veinlets. 



91. LOXOGEAMMA, Blume, Flora Jmce 73 (§)'; Presl, 

 Tent. Fterid. 214. 



Gbammitisis sp., Auci. ; Selligite^ sp., Aucf. ; AjffTEOPHTi sp., Auci. ; 

 PoLTPODll sp,, Mettenius ; Gtmnogeammatis sp., Steudel; Sywammi^ 

 s'p.,Freal; Phlebodii Bp.,J.Smithi Mecoboei ep.y Klotzach ; DEYlfA- 

 Ei£ sp,, F^e. 



Sori non-indusiate, oblong or linear, oblique, the elongate re- 

 ceptacles medial at intervals between the costa and margin. Veins 

 uniform reticulated from a central costa, the venules forming 

 unequal oblique hexagonal elongated areoles, with (rarely with- 

 out) included free veinlets. 



Fronds simple, coriaceous or sub-coridceous. Ehizome creep- 

 ing. — The uniformly reticulated venation distinguishes this genus 

 from Selliguea, in which the primary veins are pinnate and 

 prominent. The veins are often indistinct, immersed in the sub- 

 stance of the tbiokish fronds. 



Ex, : L. avenia, Fresl. I "L, elougata (GrammitiB, 8wJ 



L. lanceolata, Fred. L. macrophylla Grammitis, Wall J 



L. involuta, Fred. I L. coriacea, Presl. 



