Ixii. GENBBA OB EEBNS : 



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

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

 groups which it has been proposed to separate from Gymno- 

 gramma, 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. 



§ lfetm>gramma.—SoA elongate-linear, parallel, approximate; fronds 

 smooth or hairy. 

 Ex. : G. tomentosa, Desv. 1 G. javaniea, Bl. 



G. rofa, Bern. 1 G. procera (Grammitis, WaUJ 



§ Fleurosorug, — Sori shorter, less regular or crowded; fronds smooth or 

 hairy. 

 Ex.; G. flesuosa, Ilest>. | G. myriophylla, S«. 



G. filipendulaefolia, De»v. G. pmnila, Spr. 



G. leptophylla, Besv. \ G. ehsrophylla, Desu. 



§ Ceropteris. — Sori as in § Fleurosorm; fronds larinoso-ceraceoDfl beneath. 

 El. ; G. chrysophylla, Klfs. I G. peruviana, Degr. 



G. solphurea, De»c. G. pulehella. Linden. 



G. triangularis, KJfs. \ G. rosea, i>e«D. 



§ Eriosorus. — Sori as in § Pleurosorus ; fronds lanate beneath. 



Ex.: G. ferruginea, Xze. I G. lanata, Kl. 



G. scandens, Mett. | G. pedata, i7/s. 



86. GRAMMITIS, Swartz, Schrad. Jom-n. 1800, ii. 3, 17. 



Ceilopteris, Fresl; Plsttbogruema, JZ. Srovm; LEproaiLunu, J. 

 Smith; Tbickothemelhtm, X«n£e,' Tbichocaltmiia, Zenifcar ; GTMlfO- 

 GBAMUjiXis sp., Auct.i Mecosori sp., Klotzsch; Cetebachis sp,, Auct.; 

 C1NCIKA1.LOIS sp., Besvaux; NomoCHi..SN.£ sp,, De^cauj; ; Fhegoftb. 



BiniSSp., JfeM^lW; ACBOSIICHI sp., ^ucf.J ASFLENll sp., .^UC^.; 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. Khizome 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 diifer from the usual practice, 

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



