AsriDiE.i: — M:i'iiu(n>ir.M. 19 



subgenera leaves several sj)ecies in an equivocal position. In spite of this 

 lioniogeneity it includes a large nmnher of genera proposed at different 

 limes. 



Last ran: Veins free. 



1. Simply pinnate, pinnae not incised beyond the middle (1) N. hirtipes 



1. Simply pinnate, pinnte incised beyond the middle. 

 2. Lowest pinnae not reduced conspicuously. 



3. Lowest pinnce considerably longer than others. 



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



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



3. Lowest pinnae not longer than others. 



4. Segments of pinnu? at right angle to 

 costa. 

 • ' 5. Segments obtuse (4) 2V. crassifoUum 



5. Segments acute , |<5> ^- F^^^riei eJatius 



1(6) N. attenuatum 

 4. Segments of pinnae forming acute angles. 

 5. Veinlets less than 10 on a side. 



6. Lower surface villous (7) A^ calcaratuiii 



(3. Lower surface grandular .... (8) N. viscosum 



6. Lower surface glabrous (15) N. sagenoides 



5. Veinlets more than 10 on a side. 



6. Sori subniarginal, texture 



thin (9) y. iinmcrsum 



6. Sori marg'ual, subeoriaeeous (10) A', ligulatum 

 2. Lowest pinnfp reduced, veinlets simple. 



3. Pinnee not lobed nearly to their midrib (11) N. exiyuum 



3. Pinnae lobed nearly or quite to their rachis. 



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



4. Veinlets 8 to 12 on a side J*!^) N. Lnersseni 



1(14) N. oxydon 

 2. Lowest pinnae reduced, veinlets forked. 

 3. Lobes of pinnae entire. 



4. Sori subterminal, indusium absent (16) N. obscurum 



4. Sori subterminal, indusium present (17) N. syrmaticum 



3. Lobes of piniue toothed or pinnatifid. 



4. Surfaces glabrous, young indusium red. (18) N. erythrosorum 

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



4. Lower surface villous (20) N. flaccidum 



1. Decompound (except JV. dissectum) . 



2. Small or middle sized ferms with erect rhizome. 



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



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



2. Small or middle sized ferns, rhizome creeping. 



3. Sori marginal (23) N. reccdens 



3. Sori medial (24) N. hirtum 



2. Large ferns, indusium usually inconspicuous. 



3. Bipinnatifid (25) N. dissectum 



3. Bipinnate. 



4. Lamina glabrous (26) N. intermedium 



4. Both surfaces villous (27) N. asperulum 



3. Tripinnate. 



4. Indusium present. 



5. Frond not glabrous (28) N. setigerum 



5. Glabrous throughout (29) N. divisum 



4. Indusium wanting. 



5. Khizome erect (30) N.ornatum 



5. Rhizome creeping (31) N. rugulosum 



3. Quadrijiinnatc '.. (32) N. vicgaphyllutn 



