llii. GENEBA OF FEBffS : 



elongated sori, which, though not occurring in every sorus, does 

 occur more or less frequently over every frond. Of the many 

 groups which it has been proposed to separate from Qymno- 

 fframma, none possess characters sufficiently marked and definite, 

 at least when the sori and veins are made to afford the leading 

 distinctions ; hence we have declined to adopt them. Necker's 

 genus Phyllitis, having compound fronds, probably belongs here. 



Neurogramma. Sori elongate-linear, parallel, approximate; fronds 



smooth or hairy. 

 Ex. : G. tomentosa, Dew. I G. javanica, Bl. 



G. rufa, Desv. \ G. procera (Grammitis, Wall.} 



Pleurosorus. Sori shorter, less regular or crowded; fronds smooth or 



hairy. 



Ex. : G. flexuosa, Dcsr. I G. myriophylla, Sic. 



G, filipendulaefolia, Desv. G. pumila, Spr. 



G. leptophylla, Dem. \ G. chaerophylla, Desv. 



Ceropteris. Sori as in Pleurosorus; fronds farinoso-ceraceous beneath. 



Ex. : G. chrysophylla, Klfs. 

 G. sulphurea, Desv. 

 G. triangularis, Klfs. 



G. peruviana, Desv. 

 G. pulchella, Linden. 

 G. rosea, Desv. 



Eriosorus. Sori as in Pleurosorus; fronds lanate beneath. 



Ex. : G. ferruginea, fee. \ G. lanata, Kl. 



G. scandens, Mett. \ G; pedata, Klfs. 



86. GrBAMMITIS, Swartz, Schrad. Journ. 1800, ii. 3, 17. 



CHUOFTEBIS, Presl; PLETJBOGBAMMA, B. Brown; LEPTOGBAMMA, J. 

 Smith; TBICHOTHEMELIUM, Kunze; TRICHOCALTMMA, Zenker ; GTMNO- 



GBAMMATIS 8p., Auct. ; MECOSOBI Sp., Klotzsch ; CETEBACHIS Sp., Auct. ; 



CIITCINALIDIS sp., Desvaux; NOTHOCHL^N^ sp., Desvaux; PHEGOPTE- 

 Rii>issp.,Mettenius; ACBOSTICHI sp., Auct.; ASPLENII sp., Auct.; POLY- 

 PODII sp., Auct. 



Sori non-indusiate, oblong or elliptic, oblique ; the receptacles 

 medial or sub-terminal. Veins simple or forked from a central 

 costa ; venules free. 



Fronds simple pinnate or bi-pinnate, herbaceous or sub-cori- 

 aceous, the rachis sometimes proliferous. Ehizome short erect, 

 sometimes short or elongate creeping. There are no satisfactory 

 distinctions between the simple and compound ferns having 

 short oblong naked sori, the former generally referred to Gram- 

 mitis, the latter usually to Gymnogramma or Leptogramma. We 

 have, on this account, ventured to differ from the usual practice, 

 by uniting them, in order the better to distinguish Gymnogramma; 



