AS!'II»Ii:.K — NKrilUobUM. 19 



suhficni'ia lca\i's .■•(•vfial ^pccii--^ in :ui cijuiN ocal position. In >pil<' of tliis 

 liomofii'iii'ity it iiu-ludi's a larj^t- iiiiiiilnr of <,'ciiira proposal at (liUcri'iit 

 timos. 



Lastriiu: \'(iiis free. 



1. Simply pinnate, pinna? not Incised beyond ihe middle nt .V. Itirtiins 



1. Simply pinnate, pinntp Incised beyond the middle. 



2. Lowest pinnrp not reduced conspicuously. 



3. Lowest pinna> considerably loiiKer than others. 



4. Frond over .30 cm. high (2) N. distana 



4. Frond under 10 cm. high (3) N. (irammitoidea 



3. Lowest pinnae not longer than others. 



4. Segments of pinnie at right angle to 



cost a. 



5. Segments obtuse (4) N. cra.isifolium 



_ „ . . 1(5) .V. Faurici clatius 



5. Segments acute ) 



1(6) N. attenuatum 



4. Segments of pinnae forming acute angles. 



5. Veinlets less than 10 on a side. 



6. Lower surface villous (7) N. calcaratum 



G. Lower surface grandular .... (8) N. viacosum 



(5. Lower surface glabrous (1.5) AT. sagenoidea 



5. Veinlets more than 10 on a side. 



6. Sori submarginal, texture 



thin (9) A', iinmcrsum 



6. Sori marginal, subcoriaceous (10) N. Ugulatum 



2. Lowe.st pinna? reduced, veinlets simple. 



3. Pinnie not lobed nearly to their midrib (11) N. exiguum 



3. Pinna? lobed nearly or quite to their rachis. 



4. Veinlets 4 or 5 on a side (12) N. Deddomci 



4. Veinlets 8 to 12 on a side |'13) A'- Luersacni 



1(14) N. orydon 

 2. Lowest pinnae reduced, veinlets forked. 

 3. Lobes of pinnse entire. 



4. Sori subtermiiial, indusiuni absent (16) N. obacurum 



4. Sori subterniinal. indusium present (17) N. syrmaticum 



3. Lobes of pinnse toothed or pinnatifid. 



4. Surfaces glabrous, young indusium red . (18) X. erythroaorum 

 4. Surfaces glabrous, indusium never red.... (19) N. Preslii 



4. Lower surface villous (20) iV. flaccidum 



1. Decompound (except .V. disscctiim) . 



2. Small or middle sized ferms with erect rhizome. 



3. Frond ovate-lanceolate, glabrous (21) N. sparaum 



3. Frond deltoid, pubescent beneath (22) N. crcnatum 



2. Small or middle sized ferns, rhizome creeping. 



3. Sori marginal (23) N. reccdcna 



3. Sori medial (24) A', hirtum 



2. Large ferns, indusium usually Inconspicuous. 



3. Bipinnatlfid (25) N. diaacctum 



3. Bipinnate. 



4. Lamina glabrous (26) N. intermedium 



4. Both surfaces villous (27) iV. aapcrulum 



3. Tripinnate. 



4. Indusium present. 



5. Frond not glabrous (28) N. aetigentm 



5. Glabrous throughout (29) A', diviaum 



4. Indusium wanting. 



5. Rhizome erect (30) A'. or>iatum 



5. Rhizome creeping (31) AT. ruguloanm 



3. Quadripinnate .. (32) X. megaphyllum 



