GENEBA OP FERNS: 



* * Veins parallel transversely combined ly a marginal vein. 



64. THAMNOPTERIS, Presl, Tent. Pterid. 105 () ; Id. 



Epim. Bot. 68. 

 NEOTTOPTEBIS, J. Smith ; ASPLENII sp., Auet. 



Sort indusiate, linear elongate, parallel, oblique ; the receptacles 

 lateral, anterior. Indusium narrow linear, membranaceous, plane. 

 Veins simple or forked from a central costa; venules approximate, 

 parallel, united at their apices by a continuous slightly arcuate 

 marginal vein. 



Fronds simple, coriaceous, often robust. Khizome short, 

 thick, erect. A well-marked group, characterised by having a 

 sub-marginal vein uniting the apices of the oblique veins, and by 

 the long narrow crowded sori. 



Ex. : T. Nidus, Presl. \ T. stipitata, Presl. 



T. Phyllitidis, Presl. T. Simonsiana (Aspleninm, HlcJ 



T. musasfolia, Presl. \ T. Grevillii (Asplenium, Wall.) 



* * * Veins reticulated, their apices combined by a marginal vein. 



65. HJEMIDICTYUM, Presl, Tent. Pterid. 110. 



r, J f Smith; ASPLENII sp., Auct.; TABACHIA sp., Presl; 

 DIPLAZII gp., Sort. 



Sori indusiate, linear elongate, parallel, oblique; the recep- 

 tacles lateral anterior. Indusium narrow, membranaceous, plane. 

 Veins simple or forked from a central costa ; venules parallel at 

 the base, reticulated towards the margin, forming trapezoid or 

 elongated areoles, their apices arcuately combined, or connected 

 by a continuous straight marginal veinlet. 



Fronds coriaceous or thin herbaceous, pinnate, sometimes 

 large. Ehizome thick, erect. The typical species is a large fern 

 with fronds of delicate texture. Both groups have the veins 

 parallel and distinct near the costa, and reticulated near the 

 margin ; the one having, and the other wanting a straight mar- 

 ginal vein. 



Havnidictyum. Marginal connecting veinlet straight. 

 Ex.: H. marginatum, Presl. 

 As-plenidictyum. Marginal veinlets arcuately connected. 



(Asplenium,iraM.> 



